Session garbage collection configuration

[viktorpetryk]

Purpose of this pull request

This pull request (PR) adds a new section about configuring garbage collection in the env.php file.

Affected DevDocs pages

• https://devdocs.magento.com/guides/v2.4/config-guide/sessions.html

Links to Magento source code

• Database sessions pile up magento2#26308

whatsnew
Added a new section about configuring garbage collection in Magento to clean up expired sessions.

[magento-engcom-team]

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[jeff-matthews]

@victorpetryk, does this apply to both the 2.4.x and 2.3.x release lines or 2.4.x only?

[viktorpetryk]

@victorpetryk, does this apply to both the 2.4.x and 2.3.x release lines or 2.4.x only?

@jeff-matthews This applies to 2.4.x only as changes to configure garbage collection from env.php file will be delivered to 2.4.2

[jeff-matthews]

Thanks for confirming @victorpetryk.

Since it applies to 2.4.x only, I need you to do the following:

1. Replace the symlinked src/guides/v2.4/config-guide/sessions.md file with a copy of the src/guides/v2.3/config-guide/sessions.md file.
2. Replace the include reference ({% include config/locate-session.md %}) from the new 2.4 file with the revised text of your new section (e436d77). We don't use this include file anywhere else in devdocs, so I don't think we need it for 2.4.
3. Revert all changes to the src/_includes/config/locate-session.md file. This will be used for 2.3 only and should not contain information about garbage collection.

I understand that may be tedious, so if you prefer, I would be happy to create a copy of your branch and do it for you in a new PR. Just let me know what you prefer.

[viktorpetryk]

@jeff-matthews Let me ask PO about the necessity to backport a fix about GC to the 2.3.x release line. And if so the devdocs will need to be updated for 2.3.x as well.

[viktorpetryk]

@jeff-matthews I've created a backported fix for the 2.3.x release line. So we can continue to proceed with this PR.

[jeff-matthews]

Sounds good @victorpetryk. Thanks!

[jeff-matthews]

running tests

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