SPT: Apply block upgrades

[sirreal]

Some SPT (Starter/Single Page Template) blocks are out of date and apply migrations on every load. They should be updated at the source.

Related to #46268

Steps to reproduce

1. Load the SPT page editor for a Simple site: /wp-admin/post-new.php?post_type=page
2. Observe block successfully updated messages reported in the console.

You may want to filter console messages like Block successfully updated for

Example messages:

Block successfully updated for `core/paragraph` (Object).

New content generated by `save` function:

<p style="font-size:50px">Introduce yourself – who you are, what you do, and where you are.</p>

Content retrieved from post body:

<p style="font-size:50px;">Introduce yourself – who you are, what you do, and where you are.</p>

Context / Source

props: @fullofcaffeine (p1602108571422000-slack-C015AL3QL7M testin p7DVsv-9rP-p2)

[noahtallen]

Now that #46268 has been fixed, I took a look at this. I think nearly all of these issues come down to this:

+ font-size:50px
- font-size:50px;

Basically every inline CSS attribute currently has semicolons at the end, but in a newer update, I guess it removes them.

[github-actions]

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