chore: fix no-base-to-string

[bradenmacdonald]

Description

In a few places on in the code we are calling .toString() on an object with a type like ReadableStream<Uint8Array<ArrayBuffer>> | BodyInit | null | undefined. Because this could be an object, oxlint is warning us against using .toString() which will just return a string like [object Object] or [object ArrayBuffer]. However, it turns out that in each case the type is already a string so we don't need to be calling .toString() at all.

Rule documentation:

• https://oxc.rs/docs/guide/usage/linter/rules/typescript/no-base-to-string.html#typescript-no-base-to-string

Part of #2559

Private ref MNG-4763

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.82%. Comparing base (36c9eba) to head (23425d2).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2597      +/-   ##
==========================================
+ Coverage   94.81%   94.82%   +0.01%     
==========================================
  Files        1225     1226       +1     
  Lines       27481    27557      +76     
  Branches     6187     6210      +23     
==========================================
+ Hits        26056    26131      +75     
- Misses       1367     1368       +1     
  Partials       58       58              

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