add ClientRequest.prototype.clearTimeout

[dylan-conway]

What does this PR do?

fixes:

• test-http-timeout-overflow.js
• test-http-timeout.js
• test-http-timeout-client-warning.js
• test-http-outgoing-settimeout.js

Adds ClientRequest.prototype.clearTimeout and changes millisecond validation to use getTimerDuration instead of validateMsecs

How did you verify your code works?

this is a simple change, not sure if a custom test is necessary

[robobun]

^{Updated 7:39 PM PT - May 14th, 2025}

❌ @Jarred-Sumner, your commit 1a434bc has 1 failures in Build #16632:

• test/js/web/websocket/autobahn.test.ts - code 1 on 🐧 20.04 x64

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bunx bun-pr 19612

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