feat(operator): introduce fallback search to KLT default namespace when KeptnTaskDefinition is not found

[odubajDT]

Fixes: #1338

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[codecov]

Codecov Report

Merging #1340 (aa24c00) into main (cc03a85) will increase coverage by 0.03%.
The diff coverage is 77.77%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1340      +/-   ##
==========================================
+ Coverage   61.21%   61.24%   +0.03%     
==========================================
  Files         138      138              
  Lines       10459    10471      +12     
==========================================
+ Hits         6402     6413      +11     
- Misses       3805     3806       +1     
  Partials      252      252              

Impacted Files	Coverage Δ
...ollers/common/providers/keptnmetric/keptnmetric.go	85.18% <0.00%> (ø)
...rator/controllers/lifecycle/keptntask/job_utils.go	40.54% <50.00%> (ø)
operator/controllers/common/helperfunctions.go	98.41% <92.30%> (-1.59%)	⬇️
operator/controllers/common/taskhandler.go	79.56% <100.00%> (-0.15%)	⬇️

Flag	Coverage Δ
certificate-operator	64.28% <ø> (ø)
component-tests	59.72% <50.00%> (+0.22%)	⬆️
lifecycle-operator	82.53% <77.77%> (+0.04%)	⬆️
metrics-operator	77.80% <ø> (ø)
scheduler	21.75% <ø> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.6% Duplication

[bacherfl]

lgtm