chore(lifecycle-operator): remove spans created by webhook

[bacherfl]

Part of #2290

This PR removes the spans created by the webhook, as they did not prove to be useful

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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

[codecov]

Codecov Report

Merging #2331 (0fab211) into main (d73008c) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2331      +/-   ##
==========================================
- Coverage   85.54%   85.49%   -0.06%     
==========================================
  Files         161      161              
  Lines       10190    10166      -24     
==========================================
- Hits         8717     8691      -26     
- Misses       1196     1197       +1     
- Partials      277      278       +1     

Files	Coverage Δ
...pod_mutator/handlers/appcreationrequest_handler.go	100.00% <100.00%> (ø)
...operator/webhooks/pod_mutator/handlers/workload.go	98.63% <100.00%> (-0.12%)	⬇️
...rator/webhooks/pod_mutator/pod_mutating_webhook.go	96.05% <100.00%> (+0.75%)	⬆️

... and 1 file with indirect coverage changes

Flag	Coverage Δ
certificate-operator	67.43% <ø> (ø)
component-tests	58.13% <ø> (+0.63%)	⬆️
lifecycle-operator	85.61% <100.00%> (-0.04%)	⬇️
metrics-operator	87.58% <ø> (ø)
scheduler	32.12% <ø> (ø)

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