Widen T12545 acceptance window

This test has been the scourge of contributors for a long time.

It has caused many failed CI runs and wasted hours debugging a test
which barely does anything. The fact is does nothing is the reason for
the flakiness and it's very sensitive to small changes in initialisation costs,
in particular adding wired-in things can cause this test to fluctuate
quite a bit.

Therefore we admit defeat and just bump the threshold up to 10% to catch
very large regressions but otherwise don't care what this test does.

Fixes #19414

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