Init MetricsWatcher during app startup #8195

Job	Run time
Self-hosted: Linux: gcc-13 coverage/sonar	0s
Self-hosted docker: Build Debug	9m 36s
Linux: clang-tidy	2m 49s
Self-hosted docker: Build Release	8m 14s
Self-hosted: Linux: gcc-13 ASAN	33m 46s
Self-hosted docker: Build RelWithDebInfo	8m 5s
${{ matrix.options.name }}	0s
Self-hosted: Linux: clang-19 TSAN WAVM	30m 4s
Self-hosted: Linux: clang-19 UBSAN	6m 44s
MacOS: Build Debug	14m 10s
MacOS: Build Release	22m 35s
MacOS WAVM: Build Debug	15m 59s
Zombie-Tests	0s
	2h 32m 2s

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