fix: fetch topics on MFE load

[awais-ansari]

This resolved the issue mentioned in this discussion.

Topics are essential for each tab and post creation.
Fetch topics during the MFE load instead of in each tab so that they are available before creating a post.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@               Coverage Diff               @@
##             release/ulmo     #843   +/-   ##
===============================================
  Coverage                ?   94.58%           
===============================================
  Files                   ?      164           
  Lines                   ?     3620           
  Branches                ?      994           
===============================================
  Hits                    ?     3424           
  Misses                  ?      182           
  Partials                ?       14           

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