KTOR-8901 Remove @KtorDsl from functions

[osipxd]

Subsystem
Core

Motivation
KTOR-8901 Remove AnnotationTarget.FUNCTION from @KtorDsl

Solution
This PR removes wrongly used @KtorDsl annotation to make it possible to remove the annotation target FUNCTION in the future.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch osipxd/ktordsl-remove-function-target

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[bjhham]

I'd merge this into the next patch release, however this change might break code misusing the @KtorDsl annotation. The main point why I want it to be included is that this change prevents further misuse of the @KtorDsl annotation.

It sounds like you meant to select main for the base branch in this case...

[osipxd]

We could merge all changes except for removing the target into the patch release 🤔
And merge removing the target into the main.