remove flux-specific .sourceignore and gitlab-agent HelmRelease

The HelmRelease/HelmRepository CRs targeted flux-system; with flux uninstalled
they were never being applied. The gitlab-agent workload is not deployed on
the cluster.

.sourceignore

@@ -1,21 +0,0 @@
-# Exclude non-Kubernetes files from Flux sync
-.git/
-.gitlab/
-.elixir-tools/
-.expert/
-.claude/
-_build/
-deps/
-cover/
-test/
-assets/
-config/
-lib/
-priv/
-*.md
-*.exs
-*.ex
-mix.*
-.formatter.exs
-.gitignore
-Dockerfile

towerops/gitlab-agent-helm-release.yaml

@@ -1,25 +0,0 @@
----
-apiVersion: helm.toolkit.fluxcd.io/v2
-kind: HelmRelease
-metadata:
-  name: gitlab-agent
-  namespace: flux-system
-spec:
-  chart:
-    spec:
-      chart: gitlab-agent
-      reconcileStrategy: ChartVersion
-      sourceRef:
-        kind: HelmRepository
-        name: gitlab
-        namespace: flux-system
-  install:
-    createNamespace: true
-  interval: 1m0s
-  releaseName: gitlab-agent
-  storageNamespace: gitlab-agent
-  targetNamespace: gitlab-agent
-  values:
-    config:
-      kasAddress: wss://kas.gitlab.com
-      secretName: gitlab-agent-token

towerops/gitlab-helm-repository.yaml

@@ -1,9 +0,0 @@
----
-apiVersion: source.toolkit.fluxcd.io/v1
-kind: HelmRepository
-metadata:
-  name: gitlab
-  namespace: flux-system
-spec:
-  interval: 1m0s
-  url: https://charts.gitlab.io