hsjs: fix handling of optional query/header params

[witemple-msft]

These use a different codepath in HSJS than JSON properties, and that codepath was mishandling optional parameters by unconditionally passing them into globalThis.Number/globalThis.Boolean, etc. This patch adds an explicit check for undefined and transposes that to undefined instead of calling the parser unconditionally, which will return the default value. For parsers that don't accept undefined as an input, this would have triggered a type error or runtime error.

Closes #9156

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commit: 23764cb

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-server-js

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@typespec/http-server-js - fix ✏️

Fixed a bug that caused optional query/header parameters to be improperly converted to primitive types when not provided in a request.

[azure-sdk]

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