In cases where the Pages feature or GitLab.com is down, our helm charts will fail to install. For mission critical needs of deploying to our infrastructure, we should have the necessary repo for this duplicated on our dev instance. Utilize this issue to configure the `k8s-workloads` to pull from a git repo instead of the Pages feature, and also move that repo clone to that of our dev instance. Doing so pushes the reliance on an instance that is segregated from GitLab.com. The use of the git plugin prevents the need to spin up an entire feature set that is not desired to be enabled. Ensure that this work is completed for all gitlab managed helm charts that we utilize `k8s-workloads` for. This currently includes the gitlab helm chart and the plantuml helm chart. ## Milestones * [x] k8s-workloads/gitlab-com - works with the git plugin and the dev instance * [x] the plantuml helm chart repo is mirrored onto the dev instance * [x] k8s-workloads/gitlab-helmfiles/release/plantuml is update to utilize the git plugin and the dev instance * [x] the fluentd-elasticsearch helm chart repo is mirrored onto the dev instance * [x] k8s-workloads/gitlab-helmfiles/releases/fluentd-elasticsearch is updated to utilize the git plugin and the dev instance