Ignore previously deleted migrations

Rather than asking each contributor to sort out un-tracked files, we
ignore the db/schema_migrations for previously deleted migrations

.gitignore

@@ -95,3 +95,286 @@ webpack-dev-server.json
 apollo.config.js
 /tmp/matching_foss_tests.txt
 ee/changelogs/unreleased-ee
+
+# Removed in 02ea9bc792b9236ea8854154ea5caef1a03b07b4
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+# Removed in 71a3b0e470c64fccbb902390b1f856ee1547a978
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+# Removed in 44f9d16edca328e5bb234b853f0d670ee0b30a26
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+