Add cover.out to .gitignore (#12789)

Signed-off-by: timflannagan <[email protected]>

Author: timflannagan

.gitignore

@@ -37,6 +37,9 @@ test-report.json
 # Vscode Ginkgo test explorer report
 **/ginkgo.report
 
+# Go test coverage output
+cover.out
+
 # At time we run kgateway locally and store configuration in a local directory named `data`
 # These should be ignored, as often times `source_data` is the configuration we check into the repo
 data
@@ -56,5 +59,5 @@ dist/
 *.d
 *-build
 
-
+# Rust target directory created by cargo
 internal/envoyinit/rustformations/target/*