#10004 refactor: Use global constant for the state file name `state.json` Pull request opened by edgarrmondragon Description SSIA. 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 Refactor filesystem and S3 state store backends to centralize the state file name and align method/property overrides with typing expectations. Enhancements: • Introduce a shared constant for the state file name and replace hard-coded "state.json" usages across filesystem-based state stores. • Change filesystem state store manager labels and certain attributes to properties and adjust override annotations for better type checking and coverage control. • Simplify and tighten pattern-matching logic when listing state IDs in remote filesystem state stores. • Import and apply the typing override decorator in the S3 backend to explicitly mark overridden methods. meltano/meltano