[release-15.0] CI: extend timeouts in onlineddl_vrepl due to slow CI runners (#12583) (#12587)

* CI: extend timeouts in onlineddl_vrepl due to slow CI runners

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

* increase even further

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

---------

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Co-authored-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

go/test/endtoend/onlineddl/vrepl/onlineddl_vrepl_test.go

@@ -46,8 +46,8 @@ var (
 	onlineDDLThrottlerAppName = "online-ddl"
 	vstreamerThrottlerAppName = "vstreamer"
 
-	normalMigrationWait   = 20 * time.Second
-	extendedMigrationWait = 20 * time.Second
+	normalMigrationWait   = 45 * time.Second
+	extendedMigrationWait = 60 * time.Second
 
 	hostname              = "localhost"
 	keyspaceName          = "ks"