Propagate request handler agent metadata #1663

Job	Run time
Rust SDK Tests (ubuntu-latest)	7m 15s
Rust SDK Tests (macos-latest)	7m 2s
Rust SDK Bundled CLI Build (macos-latest)	1m 26s
Rust SDK Bundled CLI Build (ubuntu-latest)	1m 5s
Rust SDK Bundled CLI Build (windows-latest)	1m 36s
Rust SDK Tests (windows-latest)	12m 31s
	30m 55s

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