chore(codegen): remove temp output file and update gitignore (#1514)

This PR addresses two cleanup items to go along with the Github Action setup:
* Updates .gitignore to ignore the maven wrapper jar
* Removes tmp-generate-one-output at the end of generation script workflow.

.gitignore

@@ -23,6 +23,9 @@ mail.properties
 .settings/
 .sts4-cache/
 
+# Ignore to avoid pushing maven wrapper jar as binary artifact
+.mvn/wrapper/maven-wrapper.jar
+
 # Because re-configuring the directory in the share plugin leads to side effect we ignore the file
 dependency-reduced-pom.xml
 .factorypath

spring-cloud-generator/generate-all.sh

@@ -42,6 +42,7 @@ while IFS=, read -r library_name googleapis_location coordinates_version googlea
  -z $monorepo_commitish 2>&1 | tee tmp-generate-one-output || save_error_info $library_name
  set +o pipefail
 done <<< $libraries
+rm tmp-generate-one-output
 
 echo "run google-java-format on generated code"
 cd ../spring-cloud-previews