Title Optimization: update UI copy based on keywords feature availability

[lhkowalski]

Fixes #38909.

Proposed changes:

• Changed UI labels to follow new proposed design:
  • sidebar labels
  • modal title
• Only show the new change when the beta flag for keywords is enabled

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

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

Testing instructions:

• Go to the block editor, add some content to the post and check the labels for the title optimization tool on the sidebar:

With beta extensions disabled	With beta extensions enabled

• Launch the tool by clicking on the button, then check the title of the modal:

With beta extensions disabled	With beta extensions enabled

• Confirm the beta, new labels are the same provided on the design reference

[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 update/title-optimization-update-ui-copy branch.

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

  bin/jetpack-downloader test jetpack update/title-optimization-update-ui-copy
  

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]

Thank you for your PR!

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

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[dhasilva]

LGTM