pkg/cwhub: improve support for k8s config maps with custom items

[mmetc]

• allow links to links
• ignore hidden ..data directories, but allow links to their content
• allow local items in subdirectories

Todo: think what could go wrong, ex dupes

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

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[codecov]

Codecov Report

Attention: Patch coverage is 64.51613% with 44 lines in your changes missing coverage. Please review.

Project coverage is 50.85%. Comparing base (08fdfc4) to head (7aa3482).
Report is 1 commits behind head on master.

Files	Patch %	Lines
pkg/cwhub/sync.go	66.35%	26 Missing and 10 partials ⚠️
pkg/cwhub/relativepath.go	57.14%	4 Missing and 2 partials ⚠️
pkg/metabase/metabase.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3154      +/-   ##
==========================================
- Coverage   50.86%   50.85%   -0.02%     
==========================================
  Files         325      326       +1     
  Lines       38685    38744      +59     
==========================================
+ Hits        19677    19703      +26     
- Misses      17081    17102      +21     
- Partials     1927     1939      +12     

Flag	Coverage Δ
bats	40.28% <70.52%> (+0.04%)	⬆️
unit-linux	34.03% <54.73%> (+0.04%)	⬆️
unit-windows	28.51% <52.41%> (+0.04%)	⬆️

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