feat(gitSpec): add targetPath for subdir values

[nijdarshan]

Summary

• Add targetPath to GitConfig for specifying values file location
• Enables multiple envs in single repo (e.g. envs/dev/, envs/prod/)
• Non-breaking: empty default preserves existing behavior

Changes

• Add TargetPath to GitConfig struct
• Prefix values files with targetPath
• Add Path to multi-source valuesSource
• Add global.targetPath helm param
• Add tests

Test plan

• make test passes
• make generate manifests runs clean
• CI passes

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: nijdarshan
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[openshift-ci]

Hi @nijdarshan. Thanks for your PR.

I'm waiting for a validatedpatterns member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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