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

[Jarred-Sumner]

While investigating a memory leak, I noticed that the streams helpers in hono unconditionally attach an AbortSignal to each request. As of Bun v1.1.27, we call cancel on ReadableStream so this should be unnecessary.

I verified that on Bun v1.1.26, hardcoding the isOldBunVersion function to return false caused the abort-related tests to hang and that on Bun v1.2 hardcoding the isOldBunVersion function to return false those tests pass.

There is duplicate code but it felt less invasive to duplicate the code.

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[yusukebe]

@Jarred-Sumner Thank you for the PR.

Hey @sor4chi, The CI is falling. Should we update the tests?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.33%. Comparing base (d40fffb) to head (f4d56ec).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3859      +/-   ##
==========================================
+ Coverage   91.32%   91.33%   +0.01%     
==========================================
  Files         161      162       +1     
  Lines       10242    10257      +15     
  Branches     2889     2904      +15     
==========================================
+ Hits         9353     9368      +15     
  Misses        888      888              
  Partials        1        1              

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[yusukebe]

To pass the test, specify the old version at the global.

[yusukebe]

I fixed the tests and unified the functions as one function in utils.ts. Looks good. I'll merge this.

@Jarred-Sumner Thanks!