Allow opt-in bubble-phase form tracking#1457

jethron merged 1 commit intosnowplow:release/4.6.8snowplow/snowplow-javascript-tracker:release/4.6.8from

jethron:fix/CSTMR-1776-form-bubblingjethron/snowplow-javascript-tracker:fix/CSTMR-1776-form-bubblingCopy head branch name to clipboard