beaker: fix sleeping in runtest-createrepo

The first sleep is useless with DNF5, the mechanism (unlike DNF4)
doesn't even wait for the backend action processing.

The second sleep needs to be longer.  The API call is relatively
expensive, and therefore cached for 120s.  We need to wait for cache
invalidation.

beaker-tests/Sanity/copr-cli-basic-operations/runtest-createrepo.sh

@@ -16,17 +16,17 @@ rlJournalStart
 
     rlPhaseStartTest
         rlRun "copr-cli create ${NAME_PREFIX}Createrepo --chroot $CHROOT"
-        echo "sleep 60 seconds to give backend enough time to generate the repo"
-        sleep 60
         # don't specify chroot here, rely on auto-detection
         rlRun "dnf -y copr enable ${URL}/${NAME_PREFIX}Createrepo"
         rlRun "dnf --disablerepo='*' \
             --enablerepo='copr:${URL}:$(repo_owner):${NAME_VAR}Createrepo' \
             list available 2>&1 | grep 'Failed to synchronize'" 1
 
         rlRun "copr-cli modify ${NAME_PREFIX}Createrepo --chroot fedora-rawhide-x86_64"
-        echo "sleep 60 seconds to give backend enough time to generate the repo"
-        sleep 60
+
+        echo "wait 2+ minutes to invalidate cache"
+        echo "https://github.com/fedora-copr/copr/blob/526473b43b5e0c1f84f7db624f349a50a8e2b7d9/frontend/coprs_frontend/coprs/views/apiv3_ns/apiv3_rpmrepo.py#L37"
+        sleep 125
         rlRun "dnf -y copr enable ${URL}/${NAME_PREFIX}Createrepo fedora-rawhide-x86_64"
         rlRun "dnf --disablerepo='*' \
             --enablerepo='copr:${URL}:$(repo_owner):${NAME_VAR}Createrepo' \