feat(message-system): add ab testing message #3461

Job	Run time
extract-branch	2s
build-deploy	8m 48s
popup-pages / core_in_popup	0s
popup-pages / webextension	0s
browser-support / web	1m 9s
popup-pages / web	32s
browser-support / core_in_popup	0s
methods / web	1m 8s
browser-support / webextension	0s
methods / core_in_popup	1m 5s
methods / webextension	0s
passphrase / web	45s
passphrase / webextension	24s
passphrase / core_in_popup	26s
permissions / web	7s
popup-close / web	6s
popup-close / webextension	1s
permissions / webextension	0s
permissions / core_in_popup	0s
popup-close / core_in_popup	1s
transport / core_in_popup	0s
transport / webextension	0s
transport / web	1s
unchained / web	0s
unchained / webextension	0s
webextension-examples / webextension	1s
webextension-examples / core_in_popup	0s
webextension-examples / web	0s
unchained / core_in_popup	0s
	14m 36s

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