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-error/main.tf

@@ -0,0 +1,5 @@
+resource "null_resource" "foo" {
+  triggers {
+    random = "${guid()}"
+  }
+}

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

@@ -0,0 +1 @@
+{}

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

@@ -0,0 +1,2 @@
+{"@level":"info","@message":"Terraform 1.3.7","@module":"terraform.ui","@timestamp":"2023-01-20T12:12:25.477403-05:00","terraform":"1.3.7","type":"version","ui":"1.0"}
+{"@level":"error","@message":"Error: Unsupported block type","@module":"terraform.ui","@timestamp":"2023-01-20T12:12:25.615995-05:00","diagnostic":{"severity":"error","summary":"Unsupported block type","detail":"Blocks of type \"triggers\" are not expected here. Did you mean to define argument \"triggers\"? If so, use the equals sign to assign it a value.","range":{"filename":"main.tf","start":{"line":2,"column":3,"byte":35},"end":{"line":2,"column":11,"byte":43}},"snippet":{"context":"resource \"null_resource\" \"foo\"","code":"  triggers {","start_line":2,"highlight_start_offset":2,"highlight_end_offset":10,"values":[]}},"type":"diagnostic"}