Support IDs in block wrapper attributes

[Soean]

At the moment dynamic rendered blocks don't support ​anchors.

To enable this support, we need to add this feature to the Editor and add the id in get_block_wrapper_attributes() to the block.

I already created a PR to add this support to the editor:
​https://github.com/WordPress/gutenberg/pull/44771

This ticket is for adding it to the renderd block HTML.

Adds the support for the ID attribute for dynamic rendered blocks.

Trac ticket: https://core.trac.wordpress.org/ticket/56852

Enable support in the Editor: ​https://github.com/WordPress/gutenberg/pull/44771

[poena]

It would be good if we could solve this in 6.2

[costdev]

This ticket is blocked until the corresponding ​editor PR is merged and backported to Core.

I've reached out to @annezazu to get confirmation on whether this is likely to land in 6.2.

Let's give the Editor Triage/Tech leads time to evaluate if this can land, otherwise we can move this ticket to the 6.3 milestone when it becomes available.

[Soean]

The ​editor PR is merged.
I backported the PHP changes to this ticket PR: ​https://github.com/WordPress/wordpress-develop/pull/3497

[jorgefilipecosta]

In 55230:

Block editor: Add ID support to block wrapper attributes.

This commit adds support for the ID attribute for dynamically rendered blocks.

Props Soean, flixos90, poena, costdev, Mamaduka.
Closes #56852.

Committed via: https://core.trac.wordpress.org/changeset/55230

[hellofromTonya]

Reopening as [55230] introduced a content markup regression. See #57830 for details.

[hellofromTonya]

In 55443:

Editor: Partial revert of r55230.

[55230] introduced a regression to the content markup. This changeset is a partial revert to remove the added wp-includes/block-supports/anchor.php file.

The change of adding 'id' to $attributes_to_merge in get_block_wrapper_attributes() is not reverted as this change did not impact the regression and helps to support continue development in Gutenberg for the anchor support in dynamic blocks feature.

Reference:

• ​Gutenberg PR 48592.

Follow-up [55230].

Props wildworks, mamaduka, hellofromTonya.
Fixes #57830.
See #56852.