feat: add library v2 alert [FC-0097]

[rpenido]

Description

This PR adds an Alert to the Legacy Library Page to notify the user of the process of deprecating Legacy Libraries and a Button to open the Migrate Library interface.

Before

After (with pending migrations)

After (without pending migrations)

• Which user roles will this change impact?
  "Course Author",

Supporting information

• Related to Studio Libraries v2 view: add legacy migration info banner #2169
• Depends on feat: show migration status in libraries list [FC-0097] #2417

Testing instructions

The alert has two states, so uncomment the code below and switch isMigrated to true/false to check both states.

frontend-app-authoring/src/studio-home/data/apiHooks.ts

Lines 17 to 20 in 62b3294

	// WIP: temporarily change migrated status to test the new UI
	// select: (data) => ({
	// libraries: data.libraries.map((lib) => ({ ...lib, isMigrated: true })),
	// }),

• Open the Legacy Library tab and check the Alert

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'

---

Private ref: FAL-4234

[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.65%. Comparing base (cffc4d7) to head (4bceca0).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ction/libraries-v2-tab/WelcomeLibrariesV2Alert.tsx	92.85%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2413   +/-   ##
=======================================
  Coverage   94.65%   94.65%           
=======================================
  Files        1196     1197    +1     
  Lines       26514    26529   +15     
  Branches     5915     5936   +21     
=======================================
+ Hits        25097    25112   +15     
  Misses       1347     1347           
  Partials       70       70           

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[openedx-webhooks]

Thanks for the pull request, @rpenido!

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[navinkarkera]

@rpenido Looks good 👍, Just some minor nits.

• I tested this: (Verified alert behaviour in v2 libraries tab)
• I read through the code
• I checked for accessibility issues
• Includes documentation