chore: Add test for filter command

[tejal29]

This is one of the tasks for #6683

Adding a test for filter command. This will copied over to v1 branch.

[codecov]

Codecov Report

Merging #7317 (46864ec) into main (290280e) will decrease coverage by 3.11%.
The diff coverage is 58.37%.

@@            Coverage Diff             @@
##             main    #7317      +/-   ##
==========================================
- Coverage   70.48%   67.37%   -3.12%     
==========================================
  Files         515      559      +44     
  Lines       23150    26684    +3534     
==========================================
+ Hits        16317    17978    +1661     
- Misses       5776     7415    +1639     
- Partials     1057     1291     +234     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/deploy.go	52.00% <0.00%> (-1.85%)	⬇️
cmd/skaffold/app/cmd/test.go	44.44% <0.00%> (ø)
cmd/skaffold/skaffold.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/inspect_tests.go	62.50% <14.28%> (-1.14%)	⬇️
cmd/skaffold/app/cmd/render.go	36.66% <14.28%> (-4.72%)	⬇️
cmd/skaffold/app/cmd/lsp.go	28.12% <28.12%> (ø)
cmd/skaffold/app/cmd/fix.go	54.09% <38.88%> (-22.38%)	⬇️
cmd/skaffold/app/cmd/lint.go	42.85% <42.85%> (ø)
cmd/skaffold/app/cmd/find_configs.go	48.88% <46.15%> (+0.24%)	⬆️
cmd/skaffold/app/cmd/diagnose.go	70.27% <50.00%> (+5.40%)	⬆️
... and 265 more

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[aaron-prindle]

LGTM