Cleanup type output before building new types (#77211)

Author: joshdover

package.json

@@ -63,7 +63,7 @@
     "uiFramework:createComponent": "cd packages/kbn-ui-framework && yarn createComponent",
     "uiFramework:documentComponent": "cd packages/kbn-ui-framework && yarn documentComponent",
     "kbn:watch": "node scripts/kibana --dev --logging.json=false",
-    "build:types": "tsc --p tsconfig.types.json",
+    "build:types": "rm -rf ./target/types && tsc --p tsconfig.types.json",
     "docs:acceptApiChanges": "node --max-old-space-size=6144 scripts/check_published_api_changes.js --accept",
     "kbn:bootstrap": "node scripts/build_ts_refs && node scripts/register_git_hook",
     "spec_to_console": "node scripts/spec_to_console",