Fix regex mismatch in text block

[mfarhan943]

Description

This PR resolve issue in text components where the save button became unresponsive after making changes. The problem was caused by a mismatch in the regular expressions used to match specific patterns. One pattern, @asset+block/, ended with a /, while the other, @asset+block@, ended with an @.

Supporting information

https://2u-internal.atlassian.net/browse/TNL-11741?atlOrigin=eyJpIjoiOWFjZDgwYzhjOWI3NGQ3NDk1MjIyMDgyNmRhNjQ0OTYiLCJwIjoiaiJ9

Testing instructions

1. Open a course.
2. Add a new Text component.
3. Select the text in popup.
4. Edit the component in the frontend-app-authoring interface.
5. Use the Insert/Edit Link button to add the link /asset-v1:olaX+abc99+101+type@[email protected].
6. Save the component.
7. Verify that the URL is added without any errors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.24%. Comparing base (fd6a6dd) to head (c223431).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1597      +/-   ##
==========================================
- Coverage   93.25%   93.24%   -0.01%     
==========================================
  Files        1100     1100              
  Lines       21794    21795       +1     
  Branches     4701     4701              
==========================================
  Hits        20323    20323              
- Misses       1399     1407       +8     
+ Partials       72       65       -7     

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[schenedx]

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