tests: Ensure no dangling commit partials on remote depth pull

This was already being done on the local depth pull test, so this just
adds the matching logic to the remote depth pull test.

(cherry picked from commit b4f06b4)

https://phabricator.endlessm.com/T20138

tests/test-pull-depth.sh

@@ -35,21 +35,31 @@ ${CMD_PREFIX} ostree --repo=repo remote add --set=gpg-verify=false origin $(cat
 ${CMD_PREFIX} ostree --repo=repo pull --depth=0 origin main
 find repo/objects -name '*.commit' | wc -l > commitcount
 assert_file_has_content commitcount "^1$"
+find repo/state -name '*.commitpartial' | wc -l > commitpartialcount
+assert_file_has_content commitpartialcount "^0$"
 
 ${CMD_PREFIX} ostree --repo=repo pull --depth=0 origin main
 find repo/objects -name '*.commit' | wc -l > commitcount
 assert_file_has_content commitcount "^1$"
+find repo/state -name '*.commitpartial' | wc -l > commitpartialcount
+assert_file_has_content commitpartialcount "^0$"
 
 ${CMD_PREFIX} ostree --repo=repo pull --depth=1 origin main
 find repo/objects -name '*.commit' | wc -l > commitcount
 assert_file_has_content commitcount "^2$"
+find repo/state -name '*.commitpartial' | wc -l > commitpartialcount
+assert_file_has_content commitpartialcount "^0$"
 
 ${CMD_PREFIX} ostree --repo=repo pull --depth=1 origin main
 find repo/objects -name '*.commit' | wc -l > commitcount
 assert_file_has_content commitcount "^2$"
+find repo/state -name '*.commitpartial' | wc -l > commitpartialcount
+assert_file_has_content commitpartialcount "^0$"
 
 ${CMD_PREFIX} ostree --repo=repo pull --depth=-1 origin main
 find repo/objects -name '*.commit' | wc -l > commitcount
 assert_file_has_content commitcount "^3$"
+find repo/state -name '*.commitpartial' | wc -l > commitpartialcount
+assert_file_has_content commitpartialcount "^0$"
 
 echo "ok pull depth"