Fix @oneOf support broken with declaration kind other than type

[levrik]

On #8024 it was suggested to remove support for declarationKind all together.
Since this is a breaking change and probably won't happen soon and things are currently broken if using a declarationKind other than type, I would like to propose hard-coding @oneOf declarations to type, regardless of the configured declarationKind as type is the only one working.

Fixes #7938

[changeset-bot]

🦋 Changeset detected

Latest commit: 60270c4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@graphql-codegen/visitor-plugin-common	Patch
@graphql-codegen/typescript	Patch
@graphql-codegen/typescript-document-nodes	Patch
@graphql-codegen/gql-tag-operations	Patch
@graphql-codegen/typescript-operations	Patch
@graphql-codegen/typescript-resolvers	Patch
@graphql-codegen/typed-document-node	Patch
@graphql-codegen/graphql-modules-preset	Patch
@graphql-codegen/client-preset	Patch

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[n1ru4l]

This is great, can you please add a changeset that describes this change?

[levrik]

@n1ru4l Added a changeset. I hope I did everything correct.

[n1ru4l]

@levrik waiting for another review from @charlypoly - then we should be fine :)

[levrik]

Thanks a lot for getting this merged!

[charlypoly]

@levrik Thank you for fixing this! 🙇🏼