Use error messages from backend for Epic tree interactions
What does this MR do?
This MR is currently based on the backend MR !22688 (merged).
It updates ee/app/assets/javascripts/related_items_tree
app to use error messages as supplied by backend whenever an action to add an Epic/Issue to the tree fails.
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Documentation (if required) -
Code review guidelines -
Merge request performance guidelines -
Style guides -
Database guides -
Separation of EE specific content
Availability and Testing
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. -
Tested in all supported browsers
Security
If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:
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Label as security and @ mention @gitlab-com/gl-security/appsec
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The MR includes necessary changes to maintain consistency between UI, API, email, or other methods -
Security reports checked/validated by a reviewer from the AppSec team
Closes #35546 (closed)
Edited by Kushal Pandya