CI (Buildbot, GHA): in the "Statuses" workflow, remove the tester_linuxppc64le status (#41831)

(cherry picked from commit 0d1e548)

Author: DilumAluthge

.github/workflows/statuses.yml

@@ -66,7 +66,6 @@ jobs:
                 "buildbot/tester_linux64"
                 "buildbot/tester_linuxaarch64"
                 "buildbot/tester_linuxarmv7l"
-                "buildbot/tester_linuxppc64le"
                 "buildbot/tester_macos64"
                 "buildbot/tester_win32"
                 "buildbot/tester_win64"