Update gitignore with broader kubeconfig matching pattern

Match kubeconfig pattern found in the GRC addon controller's gitignore

Signed-off-by: Janelle Law <[email protected]>
(cherry picked from commit 0d33cad736a57966722de0586723c660fb8b290e)

Author: jan-law

.gitignore

@@ -88,7 +88,7 @@ test/crds/test-policy.yaml
 !vbh/.build-harness-vendorized
 !vbh/build-harness
 !vbh/build-harness-extensions 
-kubeconfig_managed*
+kubeconfig_*
 kind_kubeconfig.yaml
 report.json
 report_*.json