[core] Add Options to set Headers to VirtualService

[ricoberger]

It is now possible to set headers to the VirtualServices created by the Helm chart.

• I adjusted the corresponding documentation for this change.
• I adjusted the values.yaml and the documentation for all values.

[codecov]

Codecov Report

Merging #603 (3eddbc9) into main (ed155d0) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #603      +/-   ##
==========================================
- Coverage   72.24%   72.23%   -0.01%     
==========================================
  Files         430      430              
  Lines       66610    66610              
  Branches     2879     2879              
==========================================
- Hits        48120    48116       -4     
- Misses      18193    18198       +5     
+ Partials      297      296       -1     

Flag	Coverage Δ
go	71.50% <ø> (-0.04%)	⬇️
node-app	0.00% <ø> (ø)
node-azure	94.62% <ø> (ø)
node-core	42.10% <ø> (ø)
node-datadog	92.84% <ø> (ø)
node-elasticsearch	91.73% <ø> (ø)
node-flux	65.99% <ø> (ø)
node-github	98.30% <ø> (ø)
node-grafana	89.65% <ø> (ø)
node-harbor	94.88% <ø> (ø)
node-helm	99.15% <ø> (ø)
node-jaeger	90.96% <ø> (ø)
node-jira	95.66% <ø> (ø)
node-kiali	89.98% <ø> (ø)
node-klogs	93.45% <ø> (ø)
node-mongodb	95.88% <ø> (ø)
node-opsgenie	83.77% <ø> (ø)
node-prometheus	88.16% <ø> (ø)
node-rss	96.16% <ø> (ø)
node-runbooks	96.36% <ø> (ø)
node-signalsciences	97.47% <ø> (ø)
node-sonarqube	96.12% <ø> (ø)
node-sql	88.83% <ø> (ø)
node-techdocs	94.20% <ø> (ø)
node-velero	82.44% <ø> (ø)

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see 1 file with indirect coverage changes

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