Fix typos in Argo CD overview dashboard

## Summary The Argo CD overview dashboard (`argocd/assets/dashboards/argo_cd_overview.json`) contains misspelled or grammatically incorrect widget titles. ## Typos | Location | Current text | Suggested fix | | --- | --- | --- | | Widget title | `Count of of Redis Requests` | `Count of Redis Requests` | | Widget title | `Number of Non Successful Application Syncs` | `Number of Unsuccessful Application Syncs` | ## Impact These typos are visible to users in the shipped Argo CD dashboard template and affect readability. ## Proposed fix Update the widget titles in `argocd/assets/dashboards/argo_cd_overview.json` to use the corrected text above.