Initial implementation of structured logging in cloud backend (#32504)

* Implementation of structured logging.

These are the changes that enable the cloud backend to consume
structured logs and make use of the new plan renderer. This will enable
CLI-driven runs to view the structured output in the Terraform Cloud UI.

* Cloud structured logging unit tests

* Remove deferred logs logic, fix minor issues

Color formatting fixes, log type stop lists, default behavior for logs
that are unknown

* Use service disco path in redacted plan url

internal/cloud/testdata/plan-json-basic/main.tf

@@ -0,0 +1 @@
+resource "null_resource" "foo" {}

internal/cloud/testdata/plan-json-basic/plan-redacted.json

@@ -0,0 +1,116 @@
+{
+  "plan_format_version": "1.1",
+  "resource_drift": [],
+  "resource_changes": [
+    {
+      "address": "null_resource.foo",
+      "mode": "managed",
+      "type": "null_resource",
+      "name": "foo",
+      "provider_name": "registry.terraform.io/hashicorp/null",
+      "change": {
+        "actions": [
+          "create"
+        ],
+        "before": null,
+        "after": {
+          "triggers": null
+        },
+        "after_unknown": {
+          "id": true
+        },
+        "before_sensitive": false,
+        "after_sensitive": {}
+      }
+    }
+  ],
+  "relevant_attributes": [],
+  "output_changes": {},
+  "provider_schemas": {
+    "registry.terraform.io/hashicorp/null": {
+      "provider": {
+        "version": 0,
+        "block": {
+          "description_kind": "plain"
+        }
+      },
+      "resource_schemas": {
+        "null_resource": {
+          "version": 0,
+          "block": {
+            "attributes": {
+              "id": {
+                "type": "string",
+                "description": "This is set to a random value at create time.",
+                "description_kind": "plain",
+                "computed": true
+              },
+              "triggers": {
+                "type": [
+                  "map",
+                  "string"
+                ],
+                "description": "A map of arbitrary strings that, when changed, will force the null resource to be replaced, re-running any associated provisioners.",
+                "description_kind": "plain",
+                "optional": true
+              }
+            },
+            "description": "The `null_resource` resource implements the standard resource lifecycle but takes no further action.\n\nThe `triggers` argument allows specifying an arbitrary set of values that, when changed, will cause the resource to be replaced.",
+            "description_kind": "plain"
+          }
+        }
+      },
+      "data_source_schemas": {
+        "null_data_source": {
+          "version": 0,
+          "block": {
+            "attributes": {
+              "has_computed_default": {
+                "type": "string",
+                "description": "If set, its literal value will be stored and returned. If not, its value defaults to `\"default\"`. This argument exists primarily for testing and has little practical use.",
+                "description_kind": "plain",
+                "optional": true,
+                "computed": true
+              },
+              "id": {
+                "type": "string",
+                "description": "This attribute is only present for some legacy compatibility issues and should not be used. It will be removed in a future version.",
+                "description_kind": "plain",
+                "deprecated": true,
+                "computed": true
+              },
+              "inputs": {
+                "type": [
+                  "map",
+                  "string"
+                ],
+                "description": "A map of arbitrary strings that is copied into the `outputs` attribute, and accessible directly for interpolation.",
+                "description_kind": "plain",
+                "optional": true
+              },
+              "outputs": {
+                "type": [
+                  "map",
+                  "string"
+                ],
+                "description": "After the data source is \"read\", a copy of the `inputs` map.",
+                "description_kind": "plain",
+                "computed": true
+              },
+              "random": {
+                "type": "string",
+                "description": "A random value. This is primarily for testing and has little practical use; prefer the [hashicorp/random provider](https://registry.terraform.io/providers/hashicorp/random) for more practical random number use-cases.",
+                "description_kind": "plain",
+                "computed": true
+              }
+            },
+            "description": "The `null_data_source` data source implements the standard data source lifecycle but does not\ninteract with any external APIs.\n\nHistorically, the `null_data_source` was typically used to construct intermediate values to re-use elsewhere in configuration. The\nsame can now be achieved using [locals](https://www.terraform.io/docs/language/values/locals.html).\n",
+            "description_kind": "plain",
+            "deprecated": true
+          }
+        }
+      }
+    }
+  },
+  "provider_format_version": "1.0"
+}

internal/cloud/testdata/plan-json-basic/plan.log

@@ -0,0 +1,3 @@
+{"@level":"info","@message":"Terraform 1.3.7","@module":"terraform.ui","@timestamp":"2023-01-19T10:47:27.409143-05:00","terraform":"1.3.7","type":"version","ui":"1.0"}
+{"@level":"info","@message":"null_resource.foo: Plan to create","@module":"terraform.ui","@timestamp":"2023-01-19T10:47:27.605841-05:00","change":{"resource":{"addr":"null_resource.foo","module":"","resource":"null_resource.foo","implied_provider":"null","resource_type":"null_resource","resource_name":"foo","resource_key":null},"action":"create"},"type":"planned_change"}
+{"@level":"info","@message":"Plan: 1 to add, 0 to change, 0 to destroy.","@module":"terraform.ui","@timestamp":"2023-01-19T10:47:27.605906-05:00","changes":{"add":1,"change":0,"remove":0,"operation":"plan"},"type":"change_summary"}