[Forward Port 2.3] Increase flag_data size

[aschrammel]

This PR is a forward port of PR #13579

The flag_data field in the flag table is too small to reimport a config generated by bin/magento app:config:dump with more than 64KB size.
Increasing this field should be considered, as exporting the config and reimporting it is the suggested way for pipeline deployment.

Description

If a bin/magento app:config:dump produces a config.php with more than 64KB of size, the bin/magento app:config:import or bin/magento setup:upgrade will fail because of the TEXT field limitation from flag_data in the flag table.

This PR increases the flag_data field to MEDIUMTEXT accepting 16MB.

Fixed Issues (if relevant)

#11657: app:config:import fails - flag column 'flag_data' is too short ?
Manual testing scenarios
Run bin/magento setup:install
Before applying the PR, the flag_data field is a TEXT field accepting 64KB
After applying the PR, the flag_data field is a MEDIUMTEXT field accepting 16MB

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)
• All automated tests passed successfully (all builds on Travis CI are green)

[sidolov]

@aschrammel , original pull request was closed due to inactivity, if you wish to continue, please, fix and reopen original pull request and apply fixes to port.
Thank you for collaboration!

[m2-assistant]

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[magento-engcom-team]

Hi @orlangur, thank you for the review.
ENGCOM-5524 has been created to process this Pull Request
✳️ @orlangur, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

✔️ QA Passed

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[engcom-Foxtrot]

@magento run all tests

[m2-assistant]

Hi @aschrammel, thank you for your contribution!
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[jeff-jk]

Will this be backported to 2.2?

[orlangur]

@jeff-jk nothing will be backported to 2.2 afaik, it is closed for contribution.

[jeff-jk]

Thanks for clarifying @orlangur