Bug 1810150 - stop scheduling pull-request task graphs when there's already a corresponding push graph

When a PR is opened from a branch in the main repo, we used to create a
task graph for both the push event and the pull-request open or
synchronize event, associated with the same commit, and thus essentially
doing the same work twice.

With this change, we skip the pull-request graph, and rely on the push
graph to run the required checks.  This requires corresponding changes
to the mergify config to consider either of complete-pr or complete-push
as good enough to merge a PR.

* Bug 1809859 - Let focus UI tests run when A-C dependencies and gradle config are changed

* Apply suggestions from code review

Co-authored-by: Julien Cristau <julien+github@cristau.org>

Co-authored-by: Julien Cristau <julien+github@cristau.org>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

The links point to the recent change of setting this metrics to never expire.

FAILURE: Build failed with an exception.

* Where:
Build file '/builds/worker/checkouts/vcs/focus-android/app/build.gradle' line: 613

* What went wrong:
A problem occurred configuring project ':app'.
> groovy.lang.GroovyRuntimeException: Cannot set the value of read-only property 'sourceDirectories' for task ':app:jacocoFocusDebugTestReport' of type org.gradle.testing.jacoco.tasks.JacocoReport.

Bug 1808364 - Part 2: Bump bugzilla-format action to ignore commit messages that starts with "Merge"

When checking if the commit messages are using the correct format, we want to ignore commit messages that are created by mergify that starts with "Merge"

fpsa, ftas, ftsa and ffos tags have been removed and
replaced with fpas.

For #25810 - Unified search 'search popup menu' should give hint to user that there are more menu items available by scrolling