Add block inserter onboarding tooltip

[dcalhoun]

• Gutenberg: Add native block inserter onboarding tooltip WordPress/gutenberg#32001
• Gutenberg 2: Avoid unnecessary calculation or animation if tooltip is invisible WordPress/gutenberg#32289
• WordPress iOS: Add block inserter onboarding tooltip WordPress-iOS#16537
• WordPress Android: Add block inserter onboarding tooltip WordPress-Android#14683

Fixes WordPress/gutenberg#30624. Add tooltip for the block inserter as a part of a larger editor onboarding experience.

To test: See test plan within WordPress/gutenberg#32001.

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

Wanna run full suite of Android and iOS UI tests? Click here and 'Approve' CI job!

[jhnstn]

Corresponding Gutenberg PR Approved.

[geriux]

Hey @dcalhoun 👋 Looks like some of the slash inserter tests are not passing with these changes, could you please check them out? Thanks!

[dcalhoun]

Hey @dcalhoun 👋 Looks like some of the slash inserter tests are not passing with these changes, could you please check them out? Thanks!

@geriux they appeared to be the same two tests that were failing inconsistently for others as well. I ran them locally and they passed, so I'm not sure if it's a valid failure or flakiness at this time. I have rerun them multiple times on the PR with no success. I will take a deeper look in a couple of hours when I come online for the day. 👍🏻

[geriux]

@geriux they appeared to be the same two tests that were failing inconsistently for others as well. I ran them locally and they passed, so I'm not sure if it's a valid failure or flakiness at this time. I have rerun them multiple times on the PR with no success. I will take a deeper look in a couple of hours when I come online for the day. 👍🏻

I'll double check too 👍

[jhnstn]

Hey @dcalhoun . We will cut the 1.54.0 release later today. I plan to circle back and bump this PR to the next milestone then, but please let me know if you’d rather us work to include this PR in 1.54.0. Thanks!