update provider input under helmRepositories instead of flux

General MR

Summary

Original MR added this provider configuration under the flux values but added it to the helmRepositories section in the schema. This MR fixes that and adds it under helmRepositories in the values

Relevant logs/screenshots

Feedback from user -> #2375 (comment 2660771)

Validated with helm template . AND values as follows, also works without provider ->

helmRepositories:
  - name: "ecr"
    repository: "oci://123456.dkr.ecr.us-gov-west-1.amazonaws.com"
    provider: aws
    type: "oci"

Linked Issue

Closes #2375 (closed)

Upgrade Notices

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