Avoid repeated restart snap service. (#386) #186

Job	Run time
check / Unit (3.8)	23s
check / Lint (3.8)	49s
check / Unit (3.10)	24s
check / Lint (3.10)	51s
check / functional tests (ubuntu-22.04, tox -e func -- -v --base ubuntu@20.04 --keep-models, 3.4/stable)	14m 23s
check / functional tests (ubuntu-22.04, tox -e func -- -v --base ubuntu@22.04 --keep-models, 3.4/stable)	14m 23s
check / functional tests (ubuntu-22.04, tox -e func -- -v --base ubuntu@24.04 --keep-models, 3.4/stable)	13m 34s
check / functional tests (Ubuntu_ARM64_4C_16G_01, tox -e func -- -v --base ubuntu@20.04 --keep-models, 3....	17m 20s
check / functional tests (Ubuntu_ARM64_4C_16G_01, tox -e func -- -v --base ubuntu@22.04 --keep-models, 3....	15m 35s
release (ubuntu-22.04)	21m 49s
release (Ubuntu_ARM64_4C_16G_01)	33m 9s
	2h 12m 40s

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