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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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@c2f611f). Learn more about missing BASE report.
⚠️ Report is 11 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   +/-   ##
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  Coverage          ?   62.24%           
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  Files             ?      351           
  Lines             ?    49214           
  Branches          ?        0           
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  Hits              ?    30632           
  Misses            ?    15656           
  Partials          ?     2926           

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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