fix(template): Proxy Compile Input loses values from arrays

[tekerson]

Changes

This change prevents the values in Array<string> inputs (e.g. prBodyNotes) from being stripped by the proxyCompileInput / allowed fields process.

Context

I was trying to implement a "fallback" rule that provides general instructions if there aren't any other rules in place. Based on the documentation, I believe something like this should work.

        {
            "matchPackagePatterns": ["*"],
            "prBodyNotes": `{{#unless prBodyNotes}}Only show this if there aren't more specific configurations{{/unless}}`
        }

Unfortunately, it rendered the fallback message even when another rule (that includes prBodyNotes) matches, indicating that the prBodyNotes value is not being supplied in the template context.

After having a look at the implementation and tests, I believe it is because the proxyCompileInput is dropping the values in prBodyNotes when it attempts to recurse into the array. I don't believe this is intentional, as prBodyNotes (et al) is listed in the exposedConfigOptions.

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

[renovate-release]

🎉 This PR is included in version 35.69.4 🎉

The release is available on:

• GitHub release
• 35.69.4

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