Optimize shm watchdog storage #11794

Job	Run time
Typos Check	7s
determine-runner	3s
Coverage (ubuntu-latest, nightly)	24m 8s
markdown_lint	6s
Lints and doc tests on ubuntu-latest	37s
Lints and doc tests on windows-latest	1m 35s
Unit tests on windows-latest	44m 36s
Check zenoh using Rust 1.75 (ubuntu-latest)	52s
Check zenoh using Rust 1.75 (macos-latest)	1m 23s
Lints and doc tests on macos-latest	1m 3s
Check zenoh using Rust 1.75 (windows-latest)	2m 1s
Unit tests on macos-latest	26m 47s
Unit tests on ubuntu-latest	38m 37s
Memory leak checks	0s
CI status checks	4s
	2h 21m 59s

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