fix: resolve argocdService initialization issue in notifications CLI (cherry-pick #24664 for 3.1)

[argo-cd-cherry-pick-bot]

Cherry-picked fix: resolve argocdService initialization issue in notifications CLI (#24664)

Signed-off-by: puretension [email protected]

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.33%. Comparing base (4081e29) to head (068b080).
⚠️ Report is 27 commits behind head on release-3.1.

Files with missing lines	Patch %	Lines
cmd/argocd/commands/admin/notifications.go	0.00%	2 Missing ⚠️
util/notification/settings/settings.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-3.1   #24681      +/-   ##
===============================================
- Coverage        60.34%   60.33%   -0.01%     
===============================================
  Files              346      346              
  Lines            59252    59254       +2     
===============================================
- Hits             35756    35753       -3     
+ Misses           20614    20612       -2     
- Partials          2882     2889       +7     

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