Rename proboctl CLI binary to prb

Shorter CLI name for faster typing. Renames the binary, build targets,
goreleaser config, command examples, and documentation.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/cmd/soa/list/list.go

@@ -96,7 +96,7 @@ func NewCmdList(f *cmdutil.Factory) *cobra.Command {
 			}
 
 			if flagOrg == "" {
-				return fmt.Errorf("organization is required; pass --org or set a default with 'proboctl auth login'")
+				return fmt.Errorf("organization is required; pass --org or set a default with 'prb auth login'")
 			}
 
 			variables := map[string]any{