Add richText identifier to blocks

[akasunil]

Fixed #58996

What?

Added RichText Identifier to some blocks.

Why?

getSelectionStart() function of block editor return number as attribute key for blocks instead of attribute name in string.

How?

I have added RichText Identifier argument for some block's RichText component where this argument was missing.

Testing Instructions

• Go to gutenberg editor
• Focus on core/file block
• Execute wp.data.select("core/block-editor").getSelectionStart()
• you will receive focused attribute name as string ( either fileName or downloadButtonText, whichever you are editing) instead of number

[github-actions]

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Co-authored-by: jsnajdr <jsnajdr@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
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[Mamaduka]

Thanks for the PR, @sunil25393! Could you include testing instructions in the PR description?

[akasunil]

@Mamaduka Updated PR description with testing instructions

[jsnajdr]

Looks good, thank you for a thorough fix 👍

[jsnajdr]

@sunil25393 Can you please rebase your fork branch onto the latest trunk? That should hopefully fix the failing e2e tests.