jetpack-mu-wpcom: remove linting rule overrides

[tbradsha]

This corrects some lints and then removes the following overrides in said package:

'jsdoc/require-returns': 'off',
'jsdoc/require-param-type': 'off',

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

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

Testing instructions:

• Is CI happy?
• Does this run fine? pnpm lint-file projects/packages/jetpack-mu-wpcom/

[github-actions]

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 fix/jetpack-mu-wpcom/eslint_fixes 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-mu-wpcom-plugin fix/jetpack-mu-wpcom/eslint_fixes
  

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[github-actions]

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[anomiex]

The added docs seem plausible, but I didn't dig in to verify them.

[anomiex]

Looks like I had a typo here, that should have been jsdoc/require-returns-type like below and in the old code. 😳

[anomiex]

I verified that in TS files it's also ok with something like this

	 * @return This component is non-rendering.

I have no opinion on whether you should make that sort of change here and in other TS files in this PR. 🙂

[tbradsha]

No opinion myself either, but the extra doc shouldn't hurt here so I'll leave it.