fix(schema): Presave extensions keys to have an easy access to them.

Closes #3515245

added 1 commit

• 965dfedc - fix(schema): Fixes priority plugin tests.

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• 5a8ec836 - fix(schema): Improves alterable schema tests to use priority sorting too.

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added 4 commits

• 6b6d79ea - 1 commit from branch project:8.x-4.x
• 3c0ec483 - use actual alterable schema class in test
• b3275681 - delete test file
• 53fe87d2 - Merge remote-tracking branch 'origin/8.x-4.x' into 3515245-sort-extensions-by

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added 1 commit

• a20421e6 - unused use statement

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merged