chore: fix mssql build (#61017)

- the bulk connector plugin hardcodes integration tests set up today instead of inheriting the same properties from the general test set up. Remove this.
- the Dest MSSQL uses a custom network to spin up test containers that is no longer required since we are no longer in Dagger. Remove this. This also simplifies things.

buildSrc/src/main/groovy/airbyte-bulk-connector.gradle

@@ -205,11 +205,7 @@ class AirbyteBulkConnectorPlugin implements Plugin<Project> {
                 environment "AIRBYTE_CONNECTOR_INTEGRATION_TEST_RUNNER", "docker"
 
                 jvmArgs = project.test.jvmArgs
-                systemProperties = project.test.systemProperties + [
-                        'junit.jupiter.execution.parallel.enabled': 'true',
-                        'junit.jupiter.execution.parallel.config.strategy': 'fixed',
-                        'junit.jupiter.execution.parallel.config.fixed.parallelism': Math.max((Runtime.runtime.availableProcessors() / 2).toInteger(), 1).toString()
-                ]
+                systemProperties = project.test.systemProperties
                 maxParallelForks = project.test.maxParallelForks
                 maxHeapSize = project.test.maxHeapSize