qa/distros/crimson-supported-all-distros

This commit removes centos9 from crimson's supported distros. This is in
line with the wider ceph moving on to rocky10 from centos9. We have
established that crimson is compatible with rocky10. More details can be
found in this tracker: https://tracker.ceph.com/issues/75823.
Signed-off-by: Shraddha Agrawal <shraddha.agrawal000@gmail.com>

diff --git a/qa/distros/crimson-supported-all-distro/centos_9.stream.yaml b/qa/distros/crimson-supported-all-distro/centos_9.stream.yaml
deleted file mode 120000 (symlink)
index 38fea53..0000000
--- a/qa/distros/crimson-supported-all-distro/centos_9.stream.yaml
+++ /dev/null
@@ -1 +0,0 @@
-../all/centos_9.stream.yaml
\ No newline at end of file