integration-tests: Add random delay #4

Job	Run time
Whitespace-Check / check-trailing-whitespace	3s
Tests / ubuntu-22.04-Electron 38.2.2	1m 31s
Tests / windows-2022-Electron 30.4.0	2m 48s
Tests / windows-2022-Electron 38.2.2	3m 20s
Tests / ubuntu-24.04-Electron 38.2.2	1m 28s
Tests / ubuntu-24.04-Electron 30.4.0	2m 1s
Tests / ubuntu-22.04-Electron 30.4.0	1m 45s
Tests / macos-15-intel-Electron 38.2.2	2m 59s
Tests / windows-2025-Electron 38.2.2	2m 47s
Tests / macos-15-intel-Electron 30.4.0	2m 23s
Tests / macos-14-Electron 38.2.2	1m 31s
Tests / macos-26-Electron 30.4.0	1m 39s
Tests / windows-2025-Electron 30.4.0	2m 56s
Tests / macos-26-Electron 38.2.2	1m 34s
Tests / macos-14-Electron 30.4.0	1m 54s
Tests / Test Results	30s
build	0s
	31m 9s

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