feat: remove "system defined" taxonomy badge, replace w/ read-only

[bradenmacdonald]

Description

This updates the Authoring MFE to work with the PRs that remove "System-defined" taxonomies, a half-baked feature:

• Remove system-defined taxonomies, replacing with "read_only" flag openedx-core#654
• Remove system-defined taxonomies, CONTENT_TAGGING_AUTO openedx-platform#38895

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'

[openedx-webhooks]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.80%. Comparing base (27f1218) to head (76f69c2).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #3183    +/-   ##
========================================
  Coverage   95.79%   95.80%            
========================================
  Files        1398     1398            
  Lines       33528    33555    +27     
  Branches     7630     7886   +256     
========================================
+ Hits        32119    32146    +27     
  Misses       1365     1365            
  Partials       44       44            

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[jesperhodge]

Thanks for this!