NAS-131558 / 25.04 / Change observable subscription for apps widget

[RehanY147]

Changes:

Changes how we get the subscription observable in the component

Testing:

Install two apps. plex and photoprism. Go to the dashboard. Add a widget for photoprism. Large widget for the app overview. Then without saving, open the add widget form again and add another widget for the same app.

Problem:
The stats data doesn't load the second time

Fix:
The stats load every time

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-131558

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.69%. Comparing base (ecba8b5) to head (3aa9e5f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #11172   +/-   ##
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  Coverage   82.69%   82.69%           
=======================================
  Files        1652     1652           
  Lines       58334    58337    +3     
  Branches     5998     5998           
=======================================
+ Hits        48237    48240    +3     
  Misses      10097    10097           

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