Fix core/column not having templateLock inherited from posttype template

[oxyc]

Description

See #17262 although this only fixes the inconsistency, not the issues expected behavior which I personally disagree with.

Basically core/column sets the templateLock to false to override the parent core/columns blocks all. This however doesn't take into account the post type templateLock.

This PR inherits the templateLock from the parent of the parent core/columns block.

How has this been tested?

Added a locked post type template with a column block and verified it's not possible to add child blocks. On an unlocked post type template, it is still possible to add.

Types of changes

Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.

[jorgefilipecosta]

I left some possible improvements in the comments. Personally I feel this is a positive change. Thank you for your contribution 👍

[t-hamano]

Hi @oxyc,

For this issue, templateLock attribute has been added to the columns block in #26128.
Then in #42677, the column block was fixed to also inherit the global template_lock of the post type.

Therefore, sorry, this PR is closed.
If there is anything I have missed, please feel free to comment.