feat(lifecycle-operator): rename CONTEXT to KEPTN_CONTEXT in task runtimes

[bacherfl]

Closes #2491

BREAKING CHANGE: The environment variable giving deno and python runtime access to context information has been renamed from CONTEXT to KEPTN_CONTEXT

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[codecov]

Codecov Report

Merging #2521 (75b1db0) into main (540ca90) will increase coverage by 0.01%.
Report is 1 commits behind head on main.
The diff coverage is 91.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2521      +/-   ##
==========================================
+ Coverage   85.47%   85.48%   +0.01%     
==========================================
  Files         155      155              
  Lines       10149    10177      +28     
==========================================
+ Hits         8675     8700      +25     
- Misses       1196     1198       +2     
- Partials      278      279       +1     

Files	Coverage Δ
...trollers/lifecycle/keptntask/job_runner_builder.go	100.00% <ø> (ø)
...controllers/lifecycle/keptntask/runtime_builder.go	70.44% <100.00%> (ø)
...ntrollers/lifecycle/keptntask/container_builder.go	94.91% <91.17%> (-5.09%)	⬇️

Flag	Coverage Δ
certificate-operator	67.43% <ø> (ø)
component-tests	56.33% <62.85%> (+0.29%)	⬆️
lifecycle-operator	84.44% <91.42%> (+0.02%)	⬆️
metrics-operator	87.43% <ø> (ø)
scheduler	36.53% <ø> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication