qa/rgw: unpin centos for verify suite

use a random supported distro instead of centos

Fixes: https://tracker.ceph.com/issues/54102
Signed-off-by: Casey Bodley <cbodley@redhat.com>

diff --git a/qa/suites/rgw/verify/centos_latest.yaml b/qa/suites/rgw/verify/centos_latest.yaml
deleted file mode 120000 (symlink)
index bd9854e..0000000
--- a/qa/suites/rgw/verify/centos_latest.yaml
+++ /dev/null
@@ -1 +0,0 @@
-.qa/distros/supported/centos_latest.yaml
\ No newline at end of file

diff --git a/qa/suites/rgw/verify/supported-random-distro$ b/qa/suites/rgw/verify/supported-random-distro$
new file mode 120000 (symlink)
index 0000000..0862b44
--- /dev/null
+++ b/qa/suites/rgw/verify/supported-random-distro$
@@ -0,0 +1 @@
+.qa/distros/supported-random-distro$
\ No newline at end of file