fix(operator): dynamically create tracers during reconciliation

[bacherfl]

Closes #802

This PR fixes the problem that spans were not visible after setting the Otel exporter during runtime, as the CRD controllers all used the otel tracers they were given during startup. With this PR, the tracers are now maintained by the otelConfig instance to make sure traces from the current TracerProvider are being used.

[codecov]

Codecov Report

Merging #804 (652ac00) into main (f46e603) will increase coverage by 0.31%.
The diff coverage is 97.91%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #804      +/-   ##
==========================================
+ Coverage   58.33%   58.65%   +0.31%     
==========================================
  Files          97       97              
  Lines        7518     7542      +24     
==========================================
+ Hits         4386     4424      +38     
+ Misses       2941     2930      -11     
+ Partials      191      188       -3     

Impacted Files	Coverage Δ
operator/controllers/common/otel_utils.go	70.64% <93.33%> (+4.46%)	⬆️
...rator/controllers/lifecycle/keptnapp/controller.go	68.96% <100.00%> (+0.54%)	⬆️
...ontrollers/lifecycle/keptnappversion/controller.go	72.93% <100.00%> (+0.41%)	⬆️
...cle/keptnappversion/reconcile_prepostdeployment.go	81.81% <100.00%> (ø)
...cle/keptnappversion/reconcile_prepostevaluation.go	81.81% <100.00%> (ø)
...ontrollers/lifecycle/keptnevaluation/controller.go	81.50% <100.00%> (+0.21%)	⬆️
...ator/controllers/lifecycle/keptntask/controller.go	58.24% <100.00%> (+4.30%)	⬆️
...lers/lifecycle/keptnworkloadinstance/controller.go	82.95% <100.00%> (+1.51%)	⬆️
...ptnworkloadinstance/reconcile_prepostdeployment.go	81.81% <100.00%> (ø)
...ptnworkloadinstance/reconcile_prepostevaluation.go	90.90% <100.00%> (+9.09%)	⬆️
... and 4 more

Flag	Coverage Δ
component-tests	42.52% <59.45%> (+0.07%)	⬆️
keptn-lifecycle-operator	54.67% <72.91%> (+0.17%)	⬆️
klt-cert-manager	67.50% <ø> (ø)
scheduler	21.17% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[thisthat]

LGTM

[odubajDT]

awesome work, LGTM!