fix(helmfile): remove go templating strings on a best effort basis for yaml parsing

[jandersen-plaid]

Changes

This PR introduces simple regex parsing (as suggested in the linked Issue) which will remove the Go templating from the helmfile in an attempt to make it closer to pure YAML.

Note that this doesn't actually solve the problem (which is that the go templates need to be parsed), but it does a hacky enough half measure that this should work for most use cases.

Context

• Closes Helmfile extract fails with local-chart and templated name #14344

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 tick 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

[viceice]

please read https://github.com/renovatebot/renovate/blob/main/.github/contributing.md#resolve-review-comments-instead-of-commenting 🤗

[jandersen-plaid]

please read https://github.com/renovatebot/renovate/blob/main/.github/contributing.md#resolve-review-comments-instead-of-commenting 🤗

Sounds good! I just wasn't sure if you wanted me to add additional work or if I had done things improperly in the first place. Thank you for linking the guidelines though, I will keep that in mind going forward.

[viceice]

Nearly done

[renovate-release]

🎉 This PR is included in version 32.27.2 🎉

The release is available on:

• GitHub release
• 32.27.2

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