chore: re-enable tests that use isOnline #154

Job	Run time
js-test-and-release / check	1m 13s
js-test-and-release / test-node (windows-latest, lts/*)	2m 10s
js-test-and-release / test-node (ubuntu-latest, lts/*)	33s
js-test-and-release / test-node (macos-latest, lts/*)	2m 22s
js-test-and-release / test-chrome	41s
js-test-and-release / test-chrome-webworker	17s
js-test-and-release / test-firefox	31s
js-test-and-release / test-electron-main	23s
js-test-and-release / test-firefox-webworker	19s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	1m 28s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	46s
js-test-and-release / test-webkit (macos-latest, lts/*)	2m 49s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 58s
js-test-and-release / test-electron-renderer	13s
js-test-and-release / release-check	0s
js-test-and-release / release	0s
	15m 43s

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