Allow use of multiple policy types (scan -t x,y or scan -t x -t y)

[acc-jon]

Allow scanning with multiple policy types, remove mandatory use of -t option with scan command, default to enabling all policy types

[codecov]

Codecov Report

Merging #368 into master will increase coverage by 0.91%.
The diff coverage is 92.53%.

@@            Coverage Diff             @@
##           master     #368      +/-   ##
==========================================
+ Coverage   61.62%   62.53%   +0.91%     
==========================================
  Files          73       76       +3     
  Lines        1639     1679      +40     
==========================================
+ Hits         1010     1050      +40     
  Misses        539      539              
  Partials       90       90              

Impacted Files	Coverage Δ
pkg/cli/run.go	40.00% <ø> (-2.31%)	⬇️
pkg/http-server/file-scan.go	67.85% <66.66%> (ø)
pkg/http-server/remote-repo.go	62.96% <66.66%> (ø)
pkg/runtime/validate.go	81.08% <66.66%> (+1.08%)	⬆️
pkg/cli/scan.go	32.35% <100.00%> (-1.94%)	⬇️
pkg/policy/all.go	100.00% <100.00%> (ø)
pkg/policy/cloud-providers.go	100.00% <100.00%> (ø)
pkg/policy/types.go	100.00% <100.00%> (ø)
pkg/results/types.go	100.00% <100.00%> (ø)
pkg/runtime/executor.go	93.47% <100.00%> (+0.97%)	⬆️
... and 3 more

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
No Duplication information