Categories block: use supports flag for block alignment + wide align support

[ZebulanStanphill]

Description

This PR changes the code for the Categories block to use the align supports flag. It also adds support for the wide alignment to the Categories block, which strangely was lacking support for it despite already supporting the full alignment.

How has this been tested?

I opened a post with an existing Categories block and checked to make sure setting alignments worked and applied the right classes in the editor and front-end.

Types of changes

• The block now uses supports: { align: true } to add block alignment support.
• Added support for the wide alignment. (The block already supported the full alignment.)

Related PRs

• replaces Categories block: move attributes to PHP #10635 and Categories block: use supports flag for alignment + wide alignment support #10666
• Archives block: use align supports flag + add wide/full align support #10706
• Latest Posts block: use align supports flag + add left/right align support #10707
• Cover block: Use supports flag for block alignment #10758
• Latest Comments block: use align supports flag + code cleanup #11411

[aduth]

It also adds support for the wide alignment to the Categories block, which strangely was lacking support for it despite already supporting the full alignment.

Looking through the history, it may have been done this way as the original block blueprint described in #1790 did not consider a "wide" alignment option. I don't know that this was intentional, or merely overlooked. cc @melchoyce

[melchoyce]

Either overlooked, or the initial mockups predated the wide option.

[ZebulanStanphill]

@aduth @melchoyce Actually, looking at the initial mockup, it actually lacks the icon for full alignment (or at least, the icon in the mockup resembles the current wide alignment icon). This is the reverse of how the Categories block is actually currently implemented, where it has the full alignment but not wide. Personally, I see no reason why the block should only have one and not the other.

[aduth]

Looks good 👍