#9907 test: Consolidate AWS environment clean-up for tests mocking S3 Pull request opened by edgarrmondragon Description Checklist • I have read the contribution guide Was generative AI tooling used to co-author this PR? • Yes (please specify the tool below) Related Issues • Closes #XXXX Summary by Sourcery Unify and centralize AWS-related environment cleanup across S3-backed state tests to ensure consistent, isolated behavior when mocking S3, and tighten test expectations and comments around S3 state migration and upgrade flows. Enhancements: • Clarify test comments and expected behavior for S3 state backend migration, including simplifying wording and removing obsolete explanatory text. Tests: • Introduce autouse fixtures in S3 state store and S3 state backend test classes to consistently clear AWS_DEFAULT_REGION and AWS_PROFILE before each test. • Refactor S3-related tests to rely on shared environment-cleanup fixtures instead of per-test monkeypatching, reducing duplication and improving isolation. • Update the CLI upgrade state test to explicitly clear AWS-related environment variables before interacting with mocked S3. meltano/meltano