* migrate to v19
* migrate to v18
* Migration to be verified: v17 Convert minSpan to maxPerRow in panels
* Migration to be verified: 16 Grid layout migration
* Refactor v17 and v19 migrations to use shared helper functions
* Migration to be verified: 15 No-op migration for schema consistency
* Migration to be verified: 14 Shared crosshair to graph tooltip migration
* cleanup
* wip
* complete migration
* fix lint issues
* refactor and test with minimal graph config
* update tests
* extract defaults outside the func
* lint
* lint
* add missing showValues prop
* add context and fix latest version
* generate snapshots
* v13 should be no-op
* clean up
* remove v28
* remove singlestat migraiton from frontend migrator because this is an automigration
* remove unused function
* Remove v24 table plugin logic
* cleanup
* remove plugin version for automigrate as it was used only in v24 and v28 that have been removed
* cleanup
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Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>
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