feat(fleet): extract dependencies from helm blocks without a fixed releaseName

[webD97]

Changes

This PR changes the schema so that all helm blocks in fleet match even if they don't set an explicit release name.

Context

Previously, the manager for fleet ignored a helm section if it does not have a releaseName set. According to the fleet.yaml docs this field is optional in both the top level helm block and in targetCustomizations. A previously undetected but valid example:

helm:
  repo: https://prometheus-community.github.io/helm-charts
  chart: prometheus
  version: 25.19.0

targetCustomizations:
  - name: target-1
    helm:
      repo: https://prometheus-community.github.io/helm-charts
      chart: prometheus
      version: 25.19.0

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository (https://github.com/webD97/renovate-testrepo)

[secustor]

LGTM, thanks for contributing!

[renovate-release]

🎉 This PR is included in version 37.284.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 37.284.0

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