Issue #1167 - Excluded known orphaned resources exceptions

[alexmt]

ref: #1167

There are resources which are created in the namespace automatically and should not considered orphaned:

• default service account
• kubernetes service in default namespace

Such resources should be automatically ignored, instead of asking user to configure an exception

[alexec]

Conditional approval on making the suggested change.

[codecov]

Codecov Report

Merging #2178 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2178      +/-   ##
==========================================
+ Coverage   37.29%   37.31%   +0.02%     
==========================================
  Files          97       97              
  Lines       13580    13564      -16     
==========================================
- Hits         5064     5062       -2     
+ Misses       7867     7854      -13     
+ Partials      649      648       -1

Impacted Files	Coverage Δ
controller/appcontroller.go	44.15% <100%> (+0.56%)	⬆️
util/settings/settings.go	22.53% <0%> (-1.29%)	⬇️
cmd/argocd/commands/app_actions.go	0% <0%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 49a1a77...4c1eca1. Read the comment docs.