Apollo MR pipelines - Introduce FF and new component

A lot of the issues that we are facing with the MR pipelines tab is because we have both REST calls and Apollo ones. Apollo has all that we need built in and the right data is available.

For example, if we used Apollo for everything, then #419107 (closed) ould become irrelevant as Apollo cache would always be up to date. On top of that, #418156 (closed) would also be closed because we can fetch trigger jobs from our graphQL queries.

#419112 (closed) is also dependant because right now, we can only know if a pipeline has failed builds and not bridges, so we might now show the widget at the right time.

For these reasons, this issue will migrate the pipelines tab in the merge request page to Apollo.

This issue is to keep track the first step which introduce a FF and some basic scaffholding.