[Unit test] - Dismissible Tag

[guidari]

Closes #17504

Added tests for dismissible tag
We are gonna remove slug in this #17706, so we don't have to cover that part

Testing / Reviewing

• Test should be at 95.23

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.02%. Comparing base (993fb9c) to head (5a5a905).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17716      +/-   ##
==========================================
+ Coverage   78.96%   79.02%   +0.05%     
==========================================
  Files         408      407       -1     
  Lines       14020    14006      -14     
  Branches     4381     4372       -9     
==========================================
- Hits        11071    11068       -3     
+ Misses       2782     2771      -11     
  Partials      167      167              

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