Iterate through set of apps in extension_manager.any_activity method

[mahendrapaipuri]

Fixes #1156

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[codecov]

Codecov Report

Base: 79.94% // Head: 79.87% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (de59526) compared to base (2fcd759).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1157      +/-   ##
==========================================
- Coverage   79.94%   79.87%   -0.08%     
==========================================
  Files          68       68              
  Lines        8098     8099       +1     
  Branches     1600     1601       +1     
==========================================
- Hits         6474     6469       -5     
- Misses       1201     1206       +5     
- Partials      423      424       +1     

Impacted Files	Coverage Δ
jupyter_server/extension/manager.py	92.34% <0.00%> (-0.45%)	⬇️
...ter_server/services/kernels/connection/channels.py	58.59% <0.00%> (-1.11%)	⬇️

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