fix: return empty instead of error if cache unavailable

[pjiang-dev]

fixes #18126

If Redis unavailable users who on a link to an app's resource will error:
Unable to load data: error getting cached app managed resources

Instead we can return an empty managedResource object. This way users will still be able to login and see app details ect.

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• The title of the PR conforms to the Title of the PR
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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.26%. Comparing base (05ccc01) to head (f77f035).
⚠️ Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
server/application/application.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #25072      +/-   ##
==========================================
+ Coverage   60.89%   62.26%   +1.37%     
==========================================
  Files         351      351              
  Lines       60489    49214   -11275     
==========================================
- Hits        36832    30643    -6189     
+ Misses      20736    15642    -5094     
- Partials     2921     2929       +8     

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[nitishfy]

also, you'd be required to run codegen since you updated the types.go file.

[pjiang-dev]

@nitishfy types.go change was a wrong commit i added by mistake. I addressed the error message comment. PTAL again. Thanks