Use the matching complement branch when running tests in CI. (#10160)

This implements similar behavior to sytest where a matching branch is used,
if one exists. This is useful when needing to modify both application code
and tests at the same time. The following rules are used to find a matching
complement branch:

1. Search for the branch name of the pull request. (E.g. feature/foo.)
2. Search for the base branch of the pull request. (E.g. develop or release-vX.Y.)
3. Search for the reference branch of the commit. (E.g. master or release-vX.Y.)
4. Fallback to 'master', the default complement branch name.

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/10160.misc b/changelog.d/10160.misc
new file mode 100644
index 0000000000..80f378130f
--- /dev/null
+++ b/changelog.d/10160.misc
@@ -0,0 +1 @@
+Fetch the corresponding complement branch when performing CI.