Merge pull request github#19550 from github/redsun82/git-ignore-db-upgrade-checks-files

DevEx: add temporary files created by some checks to `.gitignore`

Author: redsun82

.gitignore

@@ -72,3 +72,7 @@ node_modules/
 
 # cargo build directory
 /target
+
+# some upgrade/downgrade checks create these files
+**/upgrades/*/*.dbscheme.stats
+**/downgrades/*/*.dbscheme.stats