feat: Add error messages for partial migration [FC-0107]

[ChrisChV]

Description

• Adds the error messages for partial migrations
• Which user roles will this change impact? "Course Author".

Supporting information

• Github issue: Studio Libraries v2 view: add legacy migration info banner #2169 (comment)
• Depends on fix: Unfinished migration on fail in one legacy library [FC-0107] openedx-platform#37521
• Internal ticket: FAL-4262

Testing instructions

• Create some legacy libraries with large keys, like: library-v1:LibraryOrganizationField_NOSPACES+LibraryCodeField_NOSPACESALLOWED
• Create some legacy libraries with normal keys
• Revert the changes of fix: Issue when migrating legacy libraries with large keys [FC-0107] openedx-platform#37520 to test failed migrations
• Migrate two libraries with large keys and one with a normal key. Verify the error message. Verify that the legacy library with the normal key is migrated.
• Migrate one library with large key and one with normal key. Verify the error message. Verify that the legacy library with the normal key is migrated.

Other information

Merge ASAP

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Deprecated propTypes, defaultProps, and injectIntl patterns are not used in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Do not add new fields to the Redux state/store. Use React Context to share state among multiple components.
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Imports avoid using ../. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[openedx-webhooks]

Thanks for the pull request, @ChrisChV!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.74%. Comparing base (5ce61fa) to head (39455f8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2555   +/-   ##
=======================================
  Coverage   94.74%   94.74%           
=======================================
  Files        1218     1218           
  Lines       27299    27313   +14     
  Branches     5983     5988    +5     
=======================================
+ Hits        25865    25879   +14     
  Misses       1376     1376           
  Partials       58       58           

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[rpenido]

LGTM 👍
Thank you for your work, @ChrisChV!

• I tested this using the instructions from the PR
• I read through the code
• I checked for accessibility issues
• Includes documentation