Harden MCP OAuth cancel E2E tests against create/interest race #1797

Job	Run time
Rust SDK Tests (ubuntu-latest, default)	10m 3s
Rust SDK Bundled CLI Build (windows-latest)	4m 10s
Rust SDK Tests (windows-latest, default)	12m 38s
Rust SDK Bundled CLI Build (ubuntu-latest)	2m 57s
Rust SDK Tests (ubuntu-latest, inprocess)	13m 29s
Rust SDK Tests (macos-latest, default)	8m 48s
Rust SDK Bundled CLI Build (macos-latest)	3m 42s
Rust SDK Tests (macos-latest, inprocess)	9m 36s
	1h 5m 23s

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