[FC-0036] feat: Send messages after update tags

[ChrisChV]

Description

Updates the code of Tag Drawer to send two messages to parent (if the drawer is a iframe) when the tags are updated:

• One message with updated content tags.
• One message with the content tags count.

Supporting information

• This PR is based on feat: Send message after update tags on content [FC-0036] #800
• Github Issue: Legacy Unit Page UI: Update tag counts when changes are saved in the tag drawer modular-learning#216
• Internal ticket: https://tasks.opencraft.com/browse/FAL-3734

Testing instructions

• Follow the testing instructions of [FC-0036] fix: Update tag counts when changes are saved in the tag drawer openedx-platform#34682

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.20%. Comparing base (65f45f7) to head (2c86066).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #975   +/-   ##
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  Coverage   92.20%   92.20%           
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  Files         703      703           
  Lines       12334    12334           
  Branches     2671     2667    -4     
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  Hits        11372    11372           
  Misses        926      926           
  Partials       36       36           

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[yusuf-musleh]

👍 @ChrisChV Looks good!

• I tested this: I followed the testing instructions openedx/openedx-platform#34682
• I read through the code
• I checked for accessibility issues
• Includes documentation

[xitij2000]

I think a test here would have been nice but I guess it's very temporary code.

[ChrisChV]

I think a test here would have been nice but I guess it's very temporary code.

@xitij2000 Yes, I have not do a test for this task because it is temporary and urgent. It's ready to merge

[openedx-webhooks]

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