[Unified Recorder] recorder.configureClient() design similar to the perf framework

[HarshaNalluru]

Adds configureClient method to the TestProxytHttpClient to allow instrumenting the client with the recorder policy which helps in enabling the recorder to redirect the requests of your tests to the proxy tool.

Fixes #19364

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[witemple-msft]

I like this a lot. Feels a bit nicer to say "the recorder acts on the client" and not have to have each test insert an object into the pipeline in its own code. Now if you ever need to change the way that this initialization is done, you can do it in one place instead of 150+.

[timovv]

Looks good :)

[jeremymeng]

Looks good to me