add -oidc-scopes parameter only if scopes are actually provided

[mikeywuu]

This pull request introduces a conditional check to the Helm chart deployment template for Headlamp, ensuring that the OIDC scopes argument is only included when the relevant value is set. This improves the flexibility and correctness of the deployment configuration.

Enhancement to OIDC configuration:

• charts/headlamp/templates/deployment.yaml: Added a conditional block so that the -oidc-scopes=$(OIDC_SCOPES) argument is only included if either $oidc.scopes or $scopes is not empty, preventing unnecessary or empty configuration arguments.## Summary

Related Issue

Fixes #4220

[linux-foundation-easycla]

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• ✅ login: mikeywuu / name: Mike (bd9200e)

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[skoeva]

Hi, thanks for looking into this issue! If you can, please sign the CLA so we can review and merge any changes

[skoeva]

there's a failing test in the CI:

Test failed! To update expected templates to match current output:
  1. Review the differences above carefully
  2. If the changes are related to version, run:
     make helm-update-template-version
     This will update ALL expected templates with current Helm version
  3. Verify the changes and commit them

[mikeywuu]

After thinking about it, im not sure if this might break something for other people. With this change, it would no longer be possible to get the scopes (OIDC_SCOPES) from the externalSecret. Im not sure what has to be in the externalSecret and what not.

Maybe you have an opinion about that?