qa/distros/all: add centos_latest.yaml symlink to centos_9.stream.yaml

Signed-off-by: Casey Bodley <cbodley@redhat.com>
(cherry picked from commit a85f50c24bd478144fa02df39af47944cb7bc33e)

diff --git a/qa/distros/all/centos_latest.yaml b/qa/distros/all/centos_latest.yaml
new file mode 120000 (symlink)
index 0000000..2f843a5
--- /dev/null
+++ b/qa/distros/all/centos_latest.yaml
@@ -0,0 +1 @@
+centos_9.stream.yaml
\ No newline at end of file