Add support for commonLabels in Service template

[paweligawel]

This PR enhances the Helm chart for Pact Broker by adding support for commonLabels in the templates/service.yaml manifest.

[github-actions]

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[ChrisJBurns]

@paweligawel Would you be ok to bump the helm chart version per pipeline failures

EDIT
Ignore me, I think you just need to run the pre-commit command to sort the README out. The other pipeline failure is due to the removed postgres image. I need to fix this

[paweligawel]

@ChrisJBurns I have re-run the process to regenerate the README.md and this removed newline at the end of the file.

~/github/pact-broker-chart/ add-common-label-to-service ❯❯❯ pre-commit run --all-files 
Helm Docs................................................................Passed

[ChrisJBurns]

@paweligawel I've sorted the pipeline out now which should mean things pass, however I had to bump the Chart versions again to 3.3.5, would you be able to do another bump to 3.3.6? We should be good to merge then