[WIP][T377023] - New CI step to prevent schema deletions

JavierMontonrequested to merge
feature/ci-prevent-schema-deletions into master

This MR aims to add a new step in the CI that checks if json-schemas are deleted, and fail the CI if there are deletions.

Note that because this relies in git diff filters, if a schema is renamed it won't be detected as deletion.

There is another test MR that shows how the CI fails on deletions.

Bug: T377023

Edited by JavierMonton

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