fix: run helm registry login

[FabianKramm]

What issue type does this pull request address? (keep at least one, remove the others)
/kind fix

What does this pull request do? Which issues does it resolve? (use resolves #<issue_number> if possible)
resolves #1640

Please provide a short message that should be published in the DevSpace release notes

• Fixed an issue where DevSpace was not correctly authenticating to an OCI registry if chart.username and chart.password were provided.
• Fixed an issue where DevSpace would spawn many subprocesses if devspace was used as part of a DevSpace variable

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