Resolve #3379725 "Validatable block"

Closes #3379725

added 4 commits

• 9cf9989e - Add `type: weight`.
• 7513440c - First pass at making `type: block.block.*` fully validatable.
• e2225352 - Make `type: block_settings` fully validatable. This revealed 3 wrong key-value...
• 8426591f - Make `type: block.settings.search_form_block` fully validatable so that we can...

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• 2484b5c6 - `BlockConfigSchemaTest` now passing tests without changes: `provider` should...

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• bad7b968 - For now, be lenient with `block.block.*:weight`.

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• 7c496a54 - Restore the 3 deleted config schema type properties; deprecate them instead.

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• c8f4d239 - @follow-up: update `ExtensionExists` constraint to work for optional values.
• 751235b4 - Update `BlockValidationTest` expectations.

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added 1 commit

• e87796f4 - Discovered the root cause for `status`, `info` and `view_mode`! This is just...

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• 48ec769d - @follow-up: update `ExtensionExists` constraint to accept `core` as a valid module.

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• 1f885c73 - @needs-update-path Make `block.settings.search_form_block:page_id` optional....

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• 5adf94b1 - @needs-followup Restore `provider` to the config export — it is harmless right...

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• aeafd8fe - Add-on to previous commit: revert deprecation of `block.block.*:provider`.

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• 5da57653 - @needs-follow-up Revert deprecation of `status` and `info` for `block_content`...

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• 3c8fa135 - Adjust `MappingTest` and `ValidKeysConstraintValidatorTest` expectations for...
• 710f0337 - Fix: The test "content block" blocks using a non-existent view mode.

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added 3 commits

• d3bae917 - Adjust `BlockValidationTest` expectations now that `provider` has been undeprecated.
• 38176dd9 - Some tests using `block_content` blocks do not yet install the necessary config dependencies.
• 6ff8f555 - Update `SearchBlock::defaultConfiguration()` to provide a valid default.

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added 3 commits

• 86cd9a1d - Remove two obsolete @todos.
• b582bc18 - One test block had incorrect settings.
• 2950f034 - Do not mark `type: block_settings` fully validatable, and document why.

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• 6f127a4c - Mark `type: block.settings.*` as fully validatable, and document why.
• 3ede7bad - Adjust test expectations: There are two additional migration messages with...

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• 2931636c - `phpcs`: blank space

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• d84a2678 - The reverted changes to `type: block_settings` removed the need for most of...
• 1c240d00 - Handle the `#empty_option` in `SearchBlock::blockForm()` to match the config schema.

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added 1 commit

• 79b53649 - Update path test for `\Drupal\search\Plugin\Block\SearchBlock`.

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• 4572e208 - Fix namespace.

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• 02be3b95 - Update path.

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