Undo doing less bench iterations under cfg(test)

[Wumpf]

Messed this up recently, was under the impression that this limits the iteration count only when running tests. Need to find another way to do that.

Still don't quite understand why that happens, I was fairly convinced that cfg(test) is not set for benchmarks in benches directory.

[teoxoy]

I think we should lower the numbers as the mac CI is now intermittently timing out.

It was close to timing out in this PR, timed out on trunk and #5714 causes it to time out 100% of the time due to the overhead of validation.

        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Computepass Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Submit Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Computepass Time)
        PASS [  78.520s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Computepass Time)
        PASS [  82.692s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Computepass Time)
        PASS [  83.268s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Submit Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Submit Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/4 computepasses x 2500 dispatches (Computepass Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/4 computepasses x 2500 dispatches (Submit Time)
        PASS [  77.072s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Submit Time)
        PASS [  75.059s] wgpu-benchmark::bench/root Computepass: Single Threaded/4 computepasses x 2500 dispatches (Computepass Time)
        PASS [  75.075s] wgpu-benchmark::bench/root Computepass: Single Threaded/4 computepasses x 2500 dispatches (Submit Time)

In this PR (https://github.com/gfx-rs/wgpu/actions/runs/10055037477/job/27791035441)

        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Computepass Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Submit Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Computepass Time)
        PASS [  70.293s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Computepass Time)
 TERMINATING [> 90.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Computepass Time)
 TERMINATING [> 90.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Submit Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Submit Time)
 TERMINATING [> 90.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Submit Time)

On trunk (https://github.com/gfx-rs/wgpu/actions/runs/10071973334/job/27843338838)

        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Computepass Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Submit Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Computepass Time)
        PASS [  77.019s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Computepass Time)
 TERMINATING [> 90.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Computepass Time)
 TERMINATING [> 90.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/1 computepasses x 10000 dispatches (Submit Time)
        SLOW [> 45.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Submit Time)
 TERMINATING [> 90.000s] wgpu-benchmark::bench/root Computepass: Single Threaded/2 computepasses x 5000 dispatches (Submit Time)

In #5714 (https://github.com/gfx-rs/wgpu/actions/runs/10071973334/job/27843338838)

[teoxoy]

I'll play around with the numbers and lower it in #5714.