Add -only-out-test-toml flag and serialize Env in materialized configs

[shreyas-goenka]

Summary

This PR:

1. Adds a new flag to the acceptance test framework that allows regenerating out.test.toml configuration files without running the actual tests, making it much faster to update test configurations.
2. This PR also updates the materialized config generation to now include the Env field, which was previously not serialized. This means all out.test.toml files now capture environment variables that affect test execution.

Usage

Using Make target (recommended)

make test-regenerate-configs

Using go test directly

go test ./acceptance -run '^TestAccept$' -only-out-test-toml

For a specific test

go test ./acceptance -run '^TestAccept/bundle/debug$' -only-out-test-toml

[eng-dev-ecosystem-bot]

Run: 19106872605

	Env	🔄​flaky	💚​RECOVERED	🙈​SKIP	✅​pass	🙈​skip
💚​	aws linux		1	1	356	592
💚​	aws windows		1	1	357	591
🔄​	aws-ucws linux	3		1	477	487
💚​	aws-ucws windows		1	1	480	486
💚​	azure linux		1	1	356	591
💚​	azure windows		1	1	357	590
🔄​	azure-ucws linux	3		1	473	486
💚​	azure-ucws windows		1	1	476	485
🔄​	gcp linux	10	1	1	345	593
🔄​	gcp windows	7	1	1	349	592

22 failing tests:

Test Name	aws linux	aws windows	aws-ucws linux	aws-ucws windows	azure linux	azure windows	azure-ucws linux	azure-ucws windows	gcp linux	gcp windows
TestAccept	💚​R	💚​R	🔄​f	💚​R	💚​R	💚​R	🔄​f	💚​R	💚​R	💚​R
TestAccept/bundle/deployment/bind/experiment	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
TestAccept/bundle/deployment/bind/model-serving-endpoint	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
TestAccept/bundle/deployment/unbind/permissions	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
TestAccept/bundle/resources/clusters/deploy/update-after-create	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	✅​p
TestAccept/bundle/resources/clusters/deploy/update-after-create/DATABRICKS_BUNDLE_ENGINE=terraform	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	✅​p
TestAccept/bundle/resources/dashboards/change-name	✅​p	✅​p	🔄​f	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p
TestAccept/bundle/resources/dashboards/change-name/DATABRICKS_BUNDLE_ENGINE=terraform	✅​p	✅​p	🔄​f	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p
TestAccept/bundle/resources/dashboards/simple_outside_bundle_root	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	✅​p
TestAccept/bundle/resources/dashboards/simple_outside_bundle_root/DATABRICKS_BUNDLE_ENGINE=terraform	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	✅​p
TestAccept/bundle/resources/experiments/basic	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	✅​p
TestAccept/bundle/resources/experiments/basic/DATABRICKS_BUNDLE_ENGINE=direct	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	✅​p
TestAccept/bundle/resources/models/basic	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	🔄​f
TestAccept/bundle/resources/models/basic/DATABRICKS_BUNDLE_ENGINE=direct	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
TestAccept/bundle/resources/models/basic/DATABRICKS_BUNDLE_ENGINE=terraform	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	✅​p
TestAccept/bundle/resources/registered_models/basic	🙈​s	🙈​s	✅​p	✅​p	🙈​s	🙈​s	🔄​f	✅​p	🙈​s	🙈​s
TestAccept/bundle/resources/registered_models/basic/DATABRICKS_BUNDLE_ENGINE=terraform			✅​p	✅​p			🔄​f	✅​p
TestAccept/bundle/resources/secret_scopes	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
TestAccept/bundle/run/app-with-job	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S
TestGenerateFromExistingJobAndDeploy	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
TestFsCpFileToFile/dbfs_to_dbfs	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	✅​p
TestFsCpFileToFile/dbfs_to_local	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f	✅​p

[denik]

Could you condense the PR description? E.g. "Example: New Env Section in out.test.toml" section is not necessary, we can see it in PR diff.