RendererSideContentDecoding: Refine mojo pipe creation logic.

This CL refines the mojo data pipe creation logic in
`ContentDecodingInterceptor::Intercept` for the
RendererSideContentDecoding feature. It adds UMA for the
`mojo::CreateDataPipe` result and makes the pipe size configurable via a
feature parameter.

This CL also introduces a check of the `CreateDataPipe` result, replacing the
previous `CHECK_EQ()` with proper error handling. If `CreateDataPipe` fails, the
loader client is notified with an `ERR_INSUFFICIENT_RESOURCES` error.

These changes improve error handling and provide better insights into data pipe
creation and performance.

Bug: 391950057
Change-Id: Ie879f4f89987ceadb5760b1182c099d98d47aee9
Fixed: 406053620
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6395875
Reviewed-by: Nidhi Jaju <nidhijaju@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1437928}