Fix for issue #39530 to avoid regenerating admin grid flat table

[senthilengg]

Updating indexer state hash upon creation of new encryption key from admin

Description (*)

Fixed Issues

1. Fixes @engcom-Hotel Reproduced #39206 issue in 2.4.7-p1 magento/magento2#39530

Manual testing scenarios (*)

1. Go to index management and note down the updated time
2. Change Encryption Key from Admin
3. Go to index management and ensure all of the rows with same update time or similar
4. Run setup upgrade. Should not update the indexer state table again

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)