tiltfile/helm: handle parsing version strings without v
prefix
#6408
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helm version
doesn't necessarily return a string withv
in the prefix, as it depends how it's packaged and bundled. For instance when running helm with pkgx.sh (for pinning tool dependencies):(due to https://github.com/pkgxdev/pantry/blob/main/projects/helm.sh/package.yml#L22)
Without this change, tilt fails to parse the version with error:
This fixes that.