fix(android): avoid double-counting upload progress

[fallintoplace]

Summary

ProgressRequestBody wraps its sink in FilterOutputStream. On Android, the bulk write implementation can dispatch through write(Int) for every byte. The bulk override then increments the counter again, so upload progress can report more bytes than the request length.

This changes the bulk write to delegate directly to the wrapped stream before incrementing the counter once. The old CountingOutputStream implementation used the same direct delegation.

Changelog:

[ANDROID] [FIXED] - Avoid double-counting upload progress for bulk writes.

Test plan

• Added a regression test for an 8 KiB bulk write.
• Verified the payload is unchanged.
• Verified progress never exceeds the content length and finishes with done = true.
• Ran the full com.facebook.react.modules.network.* unit-test package.
• Ran ReactAndroid:ktfmtCheck.