Move test .kubeconfig into CI setup

Inline the creation of a test .kubeconfig into the CI setup.

Signed-off-by: Felix Matouschek <fmatouschek@redhat.com>

tests/.kubeconfig

@@ -1,18 +0,0 @@
-apiVersion: v1
-clusters:
-- cluster:
-    insecure-skip-tls-verify: true
-    server: http://localhost:12345
-  name: development
-contexts:
-- context:
-    cluster: development
-    user: developer
-  name: dev-frontend
-current-context: dev-frontend
-kind: Config
-preferences: {}
-users:
-- name: developer
-  user:
-    token: ZDNffLzSlp8aSS0fht_tRnPMTOjxqgJGCyi_iy0ecUw