Enforce comment blocks allowlist on inner blocks

[dsas]

Fixes https://linear.app/a8c/issue/DOTCOM-13240/

Proposed changes:

Fixes an issue where disallowed blocks could be added as inner blocks

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[github-actions]

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Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/jetpack-mu-wpcom/src/features/verbum-comments/assets/class-verbum-block-utils.php	55/58 (94.83%)	-5.17%	3 ❤️‍🩹

Full summary · PHP report

[dsas]

It feels like this shouldn't be so complicated, am I missing a convenience function or a better way of doing things?

[dsas]

Hmm the static analysis is failing because:

Error: Plugin PhanPluginDuplicateExpressionAssignmentOperation Can simplify this assignment to $block['innerHTML'] ??= '' (requires php version 7.4 or newer)

But the PHPCS says <config name="testVersion" value="7.2-"/>....which version is it we're targeting?

.......yup, using a null coalesce fails pre-commit checks

--------------------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
--------------------------------------------------------------------------------
 65 | ERROR | null coalesce equal operator (??=) is not present in PHP version
    |       | 7.3 or earlier
    |       | (PHPCompatibility.Operators.NewOperators.t_coalesce_equalFound)
--------------------------------------------------------------------------------