Revert "Update standard.c++ pumpTo impl to use draining read"

[jasnell]

This reverts commit 226e56f.

Appears to be causing some issues. Still investigating

[ask-bonk]

ResolveMessage: Cannot find module '@opencode-ai/plugin' from '/home/runner/work/workerd/workerd/.opencode/tools/bazel-deps.ts'

github run

[ask-bonk]

@jasnell Bonk workflow failed. Check the logs for details.

View workflow run · To retry, trigger Bonk again.

[ask-bonk]

ResolveMessage: Cannot find module '@opencode-ai/plugin' from '/home/runner/work/workerd/workerd/.opencode/tools/bazel-deps.ts'

github run

[codecov-commenter]

Codecov Report

❌ Patch coverage is 80.92105% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.67%. Comparing base (19e6211) to head (c9309c6).

Files with missing lines	Patch %	Lines
src/workerd/api/streams/standard.c++	81.45%	12 Missing and 16 partials ⚠️
src/workerd/api/streams-test.c++	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6248      +/-   ##
==========================================
- Coverage   70.71%   70.67%   -0.04%     
==========================================
  Files         417      417              
  Lines      111089   111090       +1     
  Branches    18340    18329      -11     
==========================================
- Hits        78558    78515      -43     
- Misses      21581    21631      +50     
+ Partials    10950    10944       -6     

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