feat: add env-value-from as opt-in check for #705

[Nexusrex18]

Implements env-value-from check from #705 as opt-in (via config.yaml 'include'). If maintainers prefer, can add to default checks in a follow-up.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 86.20690% with 20 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 29.11%. Comparing base (dbd7529) to head (816e9ff). :warning: Report is 210 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/templates/envvarvaluefrom/template.go	87.69%	12 Missing and 4 partials :warning:
...ates/envvarvaluefrom/internal/params/gen-params.go	73.33%	2 Missing and 2 partials :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1032       +/-   ##
===========================================
- Coverage   62.36%   29.11%   -33.25%     
===========================================
  Files         197      237       +40     
  Lines        4854     6405     +1551     
===========================================
- Hits         3027     1865     -1162     
- Misses       1439     4378     +2939     
+ Partials      388      162      -226     

Flag	Coverage Δ
unit	29.11% <86.20%> (-33.25%)	:arrow_down:

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[Nexusrex18]

@janisz have made the changes you suggested

[Nexusrex18]

@janisz Thanks for the suggestions and pointing out some of my mistakes and I worked on them as suggested. I have added some new tests as follows:

1. ConfigMap failing test
2. ConfigMap passing test
3. Missing ConfigMap failing test
4. Missing Secret failing test

[janisz]

Nice! Thank you for your contribution!

I plan to release once get https://github.com/stackrox/kube-linter/pull/1045 merged