Add missing index on "cms_block" table.

[Wohlie]

Description (*)

The table cms_block miss an index for the column identifier which is used to load CMS blocks out of the database:
https://github.com/magento/magento2/blob/2.4-develop/app/code/Magento/Cms/Model/GetBlockByIdentifier.php#L47

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

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)

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[m2-assistant]

Hi @Wohlie, thank you for your contribution!
Please, complete Contribution Survey, it will take less than a minute.
Your feedback will help us to improve contribution process.

[Wohlie]

@magento run all tests

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-9077 has been created to process this Pull Request

[magento-engcom-team]

@Wohlie thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[Den4ik]

@Wohlie, thanks for contribution 👍

[Den4ik]

@magento run Functional Tests EE, Functional Tests B2B

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[m2-assistant]

Hi @Wohlie, thank you for your contribution!
Please, complete Contribution Survey, it will take less than a minute.
Your feedback will help us to improve contribution process.

[Den4ik]

@sidolov I think this PR should be available as quality patch