Add 'dash' alias for 'dashboard' command (#37515)

Add 'dash' alias for 'dashboard' command in the Convex CLI.

This allows users to use `npx convex dash` as a shorthand for `npx convex dashboard`.

### Testing
- Verified that the alias is properly added to the command
- Ran linting with `just lint-js`

GitOrigin-RevId: 67ad98b9689cab05a3f58ca3a7392ce6eeda37e7

Author: devin-ai-integration[bot]

src/cli/dashboard.ts

@@ -23,6 +23,7 @@ export const DASHBOARD_HOST = process.env.CONVEX_PROVISION_HOST
   : "https://dashboard.convex.dev";
 
 export const dashboard = new Command("dashboard")
+  .alias("dash")
   .description("Open the dashboard in the browser")
   .allowExcessArguments(false)
   .option(