fix: remove case transformation in normalizeOutputKey

[martinsolberg]

Description

Removes case transformation in normalizeOutputKey. Will allow keys to be exported as environment variables with case intact when using wildcard lookup.

Closes #536

Checklist

• Added CHANGELOG entry (only for user-facing changes)

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[hashicorp-cla]

All committers have signed the CLA.

[fairclothjm]

@martinsolberg Hi, I am sorry you are having trouble here. I think this use case makes sense. However, I think this may be a breaking change. (I haven't tested it or run the acceptance tests yet). How will this change affect the existing behavior of normalizing the selector key: https://github.com/hashicorp/vault-action?tab=readme-ov-file#simple-key?

[martinsolberg]

@fairclothjm That may very well be the case, I do not have sufficient insight to make a judgement on that. If this change introduces some unfortunate consequences, someone else will have to have a go at it.

[martinsolberg]

Use #545 to resolve this issue instead