feat(argo-cd): allow disabling individual Argo CD components

[C4tWithShell]

Description:
Adds enabled boolean flags to the four main Argo CD components - controller, server, repoServer, and applicationSet. Each can be individually excluded from the rendered Helm manifests. All flags default to true, making this backwards-compatible.

Why this is useful: In split/agent-based Argo CD deployments (e.g. argocd-agent), not all components run in every cluster. For example, a spoke cluster may only need the application controller, while the hub runs the server and repo-server. Previously, users had to work around this with post-render patches or separate chart installations.

Checklist:

• I have bumped the chart version according to versioning
• I have updated the documentation according to documentation
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.
• I have created a separate pull request for each chart according to pull requests
• My build is green (troubleshooting builds).