integration-tests: Add random delay #3

Job	Run time
Whitespace-Check / check-trailing-whitespace	5s
Tests / ubuntu-24.04 / Electron 30.4.0	1m 32s
Tests / windows-2022 / Electron 38.2.2	1m 54s
Tests / windows-2022 / Electron 30.4.0	1m 53s
Tests / windows-2025 / Electron 30.4.0	1m 56s
Tests / macos-14 / Electron 30.4.0	1m 53s
Tests / macos-14 / Electron 38.2.2	1m 53s
Tests / ubuntu-24.04 / Electron 38.2.2	1m 24s
Tests / ubuntu-22.04 / Electron 30.4.0	1m 42s
Tests / windows-2025 / Electron 38.2.2	1m 54s
Tests / macos-26 / Electron 38.2.2	1s
Tests / ubuntu-22.04 / Electron 38.2.2	1m 36s
Tests / macos-26 / Electron 30.4.0	1s
Tests / macos-15-intel / Electron 38.2.2	20s
Tests / macos-15-intel / Electron 30.4.0	1s
Tests / Test Results	30s
build	1s
	18m 36s

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