ci(gitlab-ci): Remove needs that cause invalid pipelines

This patch removes the needs relation since it requires all `parallel`
jobs to be executed before continuing, which break when only one helm
chart is linted.

Error message:
'chart-package: [keycloak]' job needs 'chart-helm-unittest: [mok]' job, but 'chart-helm-unittest: [mok]' is not in any previous stage

charts/.utils/gitlab-ci.yaml

@@ -8,8 +8,6 @@
 chart-package:
   stage: build
   extends: .chart-matrix
-  needs:
-    - chart-helm-unittest
   image: quay.io/helmpack/chart-testing:v3.6.0
   script:
     - export TMP_DIR=$(mktemp -d)