refactor(helper/streaming): Avoid attaching AbortSignal on newer versions of Bun #6184

Job	Run time
Fastly Compute	44s
Checking if it's valid for JSR	9s
Bun	9s
Deno	13s
AWS Lambda	47s
Lambda@Edge	47s
Main	1m 54s
Node.js v18.18.2	50s
Type & Bundle size Check on Main	0s
Node.js v20.x	44s
Type & Bundle size Check on PR	1m 0s
workerd	51s
Node.js v22.x	47s
Coverage	8s
	9m 3s

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