fix(helm): scan the subcharts once

[nikpivkin]

Description

Related issues

• Close Helm child chart templates don't render with overrides from parent #6380

Checklist

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• I've added tests that prove my fix is effective or that my feature works.
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[simar7]

For my understanding: could you explain why we return early here?

[nikpivkin]

We recursively traverse the directories looking for a Chart. If we detect a Chart by the Chart.yaml file, we must stop traversing that directory, as that Chart is further processed by the parser, otherwise Subcharts will be rescanned.