chore(move): useDelayedFlag to composables

[max-nextcloud]

We keep composables in the src/composables folder now.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.51%. Comparing base (f72ed43) to head (af3e23b).
⚠️ Report is 26 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7579   +/-   ##
=======================================
  Coverage   53.51%   53.51%           
=======================================
  Files         502      502           
  Lines       43509    43509           
  Branches     1131     1131           
=======================================
  Hits        23282    23282           
  Misses      20118    20118           
  Partials      109      109           

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