CDK: remove legacy authenticator references

[htrueman]

Tell us about the problem you're trying to solve

There are new requests native authenticators implemented #5731. For now we support both requests native and HttpAuthenticator authenticators. Need to remove in the whole project HttpAuthenticator.

Describe the solution you’d like

• Remove airbyte_cdk.sources.streams.http.auth module.
• Rename airbyte_cdk.sources.streams.http.requests_native_auth to airbyte_cdk.sources.streams.http.auth.
• Update airbyte_cdk.sources.streams.http.auth overrides thought the project where it's needed.

Are you willing to submit a PR?

I might take it, right after #5731 is merged.