sanitize string headers when writing request generator

[crobibero]

Fixes #4211

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[crobibero]

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[baywet]

Thank you for your contributions!
Can you please:

1. Add an entry to the changelog (unreleased, changed)
2. Add a unit test (code method writer tests, CSharp)

While I understand your main concern was about CSharp, this is most likely a concern that applies to other languages as well. Would you be willing to fix it for the other languages?

[crobibero]

I've updated all generators but typescript and cli since I wasn't able to figure out how to test them, any tips for those are appreciated

[baywet]

Thanks for making the changes! Taking this opportunity to normalize to single quotes in Ruby since we're not doing any string interpolation with those values.