Clean up some workarounds for old upstream bugs

[anomiex]

Proposed changes:

• We no longer need to care about nanoid v3 thinking "browser === esm", because the GB package that had that dep no longer does.
• Various jsx-a11y/label-has-associated-control ignores referring to jsx-eslint/eslint-plugin-jsx-a11y#869 seem to be fixed now that #39736 requires we use htmlFor. The one place still needing an ignore is jsx-eslint/eslint-plugin-jsx-a11y#578 instead.
• Remove reference to deleted renovate issue.
• Move reference to a Storybook bug to the code actually implementing the workaround.
• Update Storybook FAQ reference.
• Remove TODO references to a fixed Storybook bug (and fix a wrong prop in one story).
• Remove workaround for WordPress/WordPress-Coding-Standards#2390.

Other information:

• [ ] Have you written new tests for your changes, if applicable?
• [ ] Have you checked the E2E test CI results, and verified that your changes do not break them?
• [ ] Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

None

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• CI happy?
• Stuff still work?

[github-actions[bot]]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the update/cleanup-some-old-workarounds branch.
  • For jetpack-mu-wpcom changes, also add define( 'JETPACK_MU_WPCOM_LOAD_VIA_BETA_PLUGIN', true ); to your wp-config.php file.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack update/cleanup-some-old-workarounds

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin update/cleanup-some-old-workarounds

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions[bot]]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

• :white_check_mark: Include a description of your PR changes.
  
• :white_check_mark: Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
• :white_check_mark: Add testing instructions.
  
• :white_check_mark: Specify whether this PR includes any changes to data or privacy.
  
• :white_check_mark: Add changelog entries to affected projects
  

This comment will be updated as you work on your PR and make changes. If you think that some of those checks are not needed for your PR, please explain why you think so. Thanks for cooperation :robot:

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