[Teak] style: Fixing nits about sync units [FC-0097]

[ChrisChV]

Description

• Add a warning banner about units in the libraries sync page.

• Update the message in the sync unit modal.
• Stay visible the sync icon in the course outline.
• Add a tooltip to the edit (in normal and disabled mode) and sync button.

Supporting information

• Github issue: Sync changes from published unit #1634 (comment)
• Related to style: Fixing nits about sync units [FC-0097] #2319
• Internal ticket: FAL-4240

Testing instructions

• Go to the library home of a library
• Create a unit on a library. Publish the unit
• Go to the course outline. Add the unit from the library.
• Verify the new tooltip on the edit button.
• Go to the library and update the unit name. Publish the unit
• Go to the course outline and verify that the sync button stays visible on the unit card.
• Click the sync button, verify the new message of the preview modal.
• Verify new tooltip on the sync button.
• Go to Content > Library updated, and verify the new warning about unit updates

[openedx-webhooks]

Thanks for the pull request, @ChrisChV!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release/teak@06497bf). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff               @@
##             release/teak    #2320   +/-   ##
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  Coverage                ?   93.90%           
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  Files                   ?     1149           
  Lines                   ?    24099           
  Branches                ?     5093           
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  Hits                    ?    22629           
  Misses                  ?     1402           
  Partials                ?       68           

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[bradenmacdonald]

Works as described! I tested this on my Teak devstack.

[ChrisChV]

CC @farhaanbukhsh