Add ID Field for K8s Policies' Metadata

[Avanti19]

Changes for terrascan policies where names match with SIAC policies

These changes are relevant only for K8s policies

1. Add id field with new format
2. Update severity
3. Update category

[codecov]

Codecov Report

Merging #826 (d797200) into master (e4ae20c) will increase coverage by 0.12%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #826      +/-   ##
==========================================
+ Coverage   74.87%   74.99%   +0.12%     
==========================================
  Files         111      113       +2     
  Lines        3339     3463     +124     
==========================================
+ Hits         2500     2597      +97     
- Misses        654      675      +21     
- Partials      185      191       +6     

Impacted Files	Coverage Δ
pkg/http-server/webhook-scan-logs.go	0.00% <0.00%> (ø)
pkg/http-server/file-scan.go	81.18% <100.00%> (+0.18%)	⬆️
pkg/http-server/health.go	100.00% <100.00%> (ø)
pkg/http-server/remote-repo.go	70.14% <100.00%> (+0.45%)	⬆️
pkg/http-server/webhook-scan.go	70.73% <100.00%> (+0.73%)	⬆️
pkg/config/config-reader.go	80.64% <0.00%> (-6.32%)	⬇️
pkg/utils/severity.go	94.11% <0.00%> (-5.89%)	⬇️
pkg/iac-providers/kubernetes/v1/load-file.go	71.87% <0.00%> (-4.13%)	⬇️
pkg/utils/json.go	68.75% <0.00%> (-2.68%)	⬇️
pkg/policy/opa/engine.go	64.40% <0.00%> (-1.18%)	⬇️
... and 12 more

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information