fix(metrics-operator): convert SLI names to valid K8s resource names

[bacherfl]

Closes #2098

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[codecov]

Codecov Report

Merging #2125 (97ecf00) into main (d08df40) will increase coverage by 26.06%.
Report is 7 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2125       +/-   ##
===========================================
+ Coverage   58.26%   84.32%   +26.06%     
===========================================
  Files          35      150      +115     
  Lines        2389     9623     +7234     
===========================================
+ Hits         1392     8115     +6723     
- Misses        859     1224      +365     
- Partials      138      284      +146     

Files Changed	Coverage Δ
metrics-operator/converter/common.go	100.00% <100.00%> (ø)
metrics-operator/converter/sli_converter.go	96.20% <100.00%> (ø)
metrics-operator/converter/slo_converter.go	94.71% <100.00%> (ø)

... and 127 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	65.91% <ø> (-2.64%)	⬇️
component-tests	59.44% <ø> (+1.58%)	⬆️
lifecycle-operator	84.94% <ø> (?)
metrics-operator	87.15% <100.00%> (?)
scheduler	32.12% <ø> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication