Introduce monkey-patch to auto-insert collapsible sections in Buildkite logs

[AliSoftware]

What

This PR introduces a monkey-patch of the Fastlane::Runner#execute_action method to print a ~~~ :fastlane: [lane :#{lane_name}] #{action} collapsible group log output for every action called in your Fastfile.

Note

This idea was inspired by https://github.com/wordpress-mobile/WordPress-iOS/blob/trunk/fastlane/Fastfile#L156-L179

This will make the Buildkite logs for jobs running fastlane lanes better organized and easier to navigate, as each action will now have its own collapsible section.

Testing

I have created some dummy branches in Tumblr-iOS and WordPress-iOS, making their Gemfile point to this PR's branch of the release-toolkit then triggering a Buildkite build

Tumblr iOS

Buildkite build: https://buildkite.com/automattic/tumblr-ios/builds/32406

WordPress iOS

Buildkite build: https://buildkite.com/automattic/wordpress-ios/builds/26131

Compare Buildkite output from before that monkey-patch—but with the ad-hoc patch that has been in WPiOS's Fastfile since a while—with new Buildkite output from the monkey-patch (and with ad-hoc patch in WPiOS's Fastfile removed

What's Next

Once this PR lands, we should remove the ad-hoc patch code that was implemented in WPiOS's Fastfile, to use this patch from release-toolkit instead, to avoid WPiOS having double logging of the collapsible group sections in Buildkite.

[twstokes]

Neat!