fix: migrate library alert text [FC-0112]

[rpenido]

Description

This PR updates the alert texts on the Migrate Libraries Stepper.

Destination

Confirm

Useful information to include:

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

Supporting information

• Update Migration Library Selection Text #2582 (comment)

Testing instructions

• Verify that the alert text is updated as described in Update Migration Library Selection Text #2582 (comment)

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).
• Avoid propTypes and defaultProps 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.
• Avoid using ../ in import paths. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

---

Private ref: FAL-4270

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.83%. Comparing base (daed664) to head (f49a777).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2651   +/-   ##
=======================================
  Coverage   94.83%   94.83%           
=======================================
  Files        1234     1234           
  Lines       27764    27764           
  Branches     6263     6266    +3     
=======================================
  Hits        26331    26331           
- Misses       1362     1375   +13     
+ Partials       71       58   -13     

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[navinkarkera]

@rpenido Looks good. Thank you! 👍

• I tested this: (Verified the alert change locally)
• I read through the code
• I checked for accessibility issues
• Includes documentation

[ChrisChV]

Hi @rpenido, is there a backport for this PR?

[rpenido]

No @ChrisChV. I can do it tomorrow. Thanks for catching it!

[rpenido]

Done @ChrisChV: #2727