Replace Starter Content modal with inserter panel

[ellatrix]

What?

Builds on #66819.
Previously: #61489.

Closes #63865

Why?

The modal is super annoying, let's see if the inserter + zoom out is less annoying. You can double click the canvas to exit also.

A nice side effect is also that you can inserter multiple patterns, or browser other categories.

How?

Uses #61489.

Testing Instructions

Create a new page in the admin or site editor. Click patterns from this category.

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

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[getdave]

Playwright test failures look legit. Let's get those fixed up and then we can look to land this one.

[github-actions]

Flaky tests detected in 36a302d.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/12432233258
📝 Reported issues:

• [Flaky Test] Navigates the items list via UP/DOWN arrow keys #64334 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js

[mikachan]

It looks like this isn't needed anymore so I went ahead and removed it.

[mikachan]

I think I've fixed the failing tests, but would appreciate more eyes on the changes in case I've changed too much!

They were either failing because we'd stopped passing the full category object to the inserter, and it looks like we need access to the full object in most cases (to access name, label, and fetch); or because the inserter is now open when creating a new page, so we need to adjust a few tests to close it in order to continue the test.

These tests needed adjusting for the category object:

• editor/various/inserting-blocks.spec.js (in 07c5db9)
• site-editor/block-style-variations.spec.js (in 881d7b1)
• editor/plugins/pattern-recursion.spec.js (in c6c423e)

These tests needed adjusting for the open inserter:

• test/e2e/specs/editor/various/template-resolution.spec.js (in 2f958e0)
• test/e2e/specs/site-editor/block-style-variations.spec.js (in 881d7b1)
• test/e2e/specs/site-editor/pages.spec.js (in 4f9af6c)

[scruffian]

This is looking good to me.

[mikachan]

The last few commits resolved the discussion here about making sure zoom out is still invoked when creating a new page via the command palette. With that, I think this is ready to bring in 🎉