fix: Helm linter no longer fails with generated charts

[manusa]

Description

fix #591: Helm linter no longer fails with generated charts

• updated jkube-kit-resource-helm to use assertj instead of hamcrest

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change
• Chore (non-breaking change which doesn't affect codebase;
  test, version modification, documentation, etc.)

Checklist

• I have read the contributing guidelines
• I signed-off my commit with a user that has signed the Eclipse Contributor Agreement
• I Added CHANGELOG entry
• I have implemented unit tests to cover my changes
• I have updated the documentation accordingly
• No new bugs, code smells, etc. in SonarCloud report
• I tested my code in Kubernetes
• I tested my code in OpenShift

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[codecov]

Codecov Report

Merging #608 (97f057e) into master (7e377f7) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #608      +/-   ##
============================================
+ Coverage     42.46%   42.47%   +0.01%     
- Complexity     2885     2887       +2     
============================================
  Files           404      404              
  Lines         19490    19494       +4     
  Branches       2762     2762              
============================================
+ Hits           8277     8281       +4     
  Misses        10222    10222              
  Partials        991      991              

Impacted Files	Coverage Δ	Complexity Δ
...ava/org/eclipse/jkube/kit/resource/helm/Chart.java	96.87% <100.00%> (+0.32%)	21.00 <2.00> (+2.00)
...g/eclipse/jkube/kit/resource/helm/HelmService.java	93.27% <100.00%> (+0.05%)	26.00 <0.00> (ø)

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[manusa]

Helm E2E tests are now failing since the Chart.yaml output now ourputs an extra apiVersion: v1 field.

I'll update the tests once this PR gets merged.