don't propagate client parameter

[chunyu3]

Description

Sync microsoft/typespec#4295
Fix #4810

We will not propagate client parameters (such as endpoint, or the parameter in the uri) to each operation, so

• When create client fields we need to merge the client parameters with the parameters in each operation whose kind is Client (means the operation parameter is bumped to client level).
• When generate operation method, merge client parameters with operation parameters, we need client parameters to construe uri.

Checklist

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[chunyu3]

/azp run

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