Drastically improve the linking experience in CKEditor 5

Get foundations in place: CKEditor 5 plugin definition, route and controller. Simply copy over the linkit CKE5 plugin without tweaking it just yet.

Closes #3317769

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• be81d708 - `cspell` + `eslint`

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• 1afdad2f - `eslint`

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• 5601ebf5 - Fix `The <em class="placeholder">Link suggester</em> entity type needs to be...
• e9a9d9c9 - Remove work-around for #2441811 from `EntityLinksTest` because … that landed
• 17feef53 - Update `MappingTest` expectation.

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• 8d12934b - Update `::getEntityCounts()` expectations in upgrade path tests.

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• 8c1ad9c8 - Add `jsonapi` + `rest` test coverage for the new `EntityLinkSuggester` config entity type.

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• d91ea914 - Make `EntityLinkSuggester` config entities `FullyValidatable`, and provide the...
• 766a2b3c - Fix c/p mistake for `rest` test coverage.

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• 49839595 - Simplify the CKE5 `ValidatorsTest` now that a superset of this test coverage...
• a10c4e2c - Avoid needing to install the Stark theme.
• 862c02a4 - Refine the `EntityLinkSuggester` config entity type definition and docs.

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• cf7d1a74 - Harden `ConfigExistsConstraintValidator`.
• b3838e95 - … which simplifies the expected validation error.

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• b4b6a5c6 - bring in head
• 07414008 - pause for testing
• d300c635 - metadata, preview controls

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• 83a818f7 - media linking

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• 83a818f7...501e1ed2 - 54 commits from branch project:11.x
• f9b0a59f - pm
• 5665e901 - pom
• ff595fc3 - Merge remote-tracking branch 'origin/11.x' into 3317769-cke5-entity-link-suggestions-11.x
• 872845f2 - default permissions back

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• 1d006344 - update tests

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• ea2dc3e8 - phpcs

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• 8d83f846 - move media linkability to its own plugin

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• 69edd5d2 - fix tests

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• c45b642c - temporarily make js errors show up in the artifacts

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• 7fe35137 - change wait condition in EntityLinkSuggestionsTest

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resolved all threads

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• 93fd1b3e - account in test for autocomplete that might be hidden or might be gone entirely

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