Ensure profile flag is respected for sync command (#837)

## Changes
Fixes #836 

## Tests
Manually running `sync` command with and without the flag

Integration tests pass as well

```
--- PASS: TestAccSyncFullFileSync (13.38s)
PASS
coverage: 39.1% of statements in ./...
ok      github.com/databricks/cli/internal      14.148s coverage: 39.1% of statements in ./...


--- PASS: TestAccSyncIncrementalFileSync (11.38s)
PASS
coverage: 39.1% of statements in ./...
ok      github.com/databricks/cli/internal      11.674s coverage: 39.1% of statements in ./...
```

cmd/root/auth.go

@@ -92,7 +92,8 @@ func MustAccountClient(cmd *cobra.Command, args []string) error {
 		}
 	}
 
-	allowPrompt := !hasProfileFlag
+	noPrompt, ok := cmd.Context().Value(noPromptKey).(bool)
+	allowPrompt := !hasProfileFlag && (!ok || !noPrompt)
 	a, err := accountClientOrPrompt(cmd.Context(), cfg, allowPrompt)
 	if err != nil {
 		return err
@@ -102,6 +103,21 @@ func MustAccountClient(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+type noPrompt int
+
+var noPromptKey noPrompt
+
+// NoPrompt allows to skip prompt for profile configuration in MustWorkspaceClient.
+//
+// When calling MustWorkspaceClient we want to be able to customise if to show prompt or not.
+// Since we can't change function interface, in the code we only have an access to `cmd“ object.
+// Command struct does not have any state flag which indicates that it's being called in completion mode and
+// thus the Context object seems to be the only viable option for us to configure prompt behaviour based on
+// the context it's executed from.
+func NoPrompt(ctx context.Context) context.Context {
+	return context.WithValue(ctx, noPromptKey, true)
+}
+
 // Helper function to create a workspace client or prompt once if the given configuration is not valid.
 func workspaceClientOrPrompt(ctx context.Context, cfg *config.Config, allowPrompt bool) (*databricks.WorkspaceClient, error) {
 	w, err := databricks.NewWorkspaceClient((*databricks.Config)(cfg))

cmd/sync/sync.go

@@ -90,6 +90,7 @@ func New() *cobra.Command {
 	cmd.Flags().BoolVar(&f.watch, "watch", false, "watch local file system for changes")
 	cmd.Flags().Var(&f.output, "output", "type of output format")
 
+	cmd.PreRunE = root.MustWorkspaceClient
 	cmd.RunE = func(cmd *cobra.Command, args []string) error {
 		var opts *sync.SyncOptions
 		var err error
@@ -149,7 +150,10 @@ func New() *cobra.Command {
 	}
 
 	cmd.ValidArgsFunction = func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
-		err := root.TryConfigureBundle(cmd, args)
+		ctx := cmd.Context()
+		cmd.SetContext(root.NoPrompt(ctx))
+
+		err := root.MustWorkspaceClient(cmd, args)
 		if err != nil {
 			return nil, cobra.ShellCompDirectiveError
 		}
@@ -165,10 +169,7 @@ func New() *cobra.Command {
 		case 0:
 			return nil, cobra.ShellCompDirectiveFilterDirs
 		case 1:
-			wsc, err := databricks.NewWorkspaceClient()
-			if err != nil {
-				return nil, cobra.ShellCompDirectiveError
-			}
+			wsc := root.WorkspaceClient(cmd.Context())
 			return completeRemotePath(cmd.Context(), wsc, toComplete)
 		default:
 			return nil, cobra.ShellCompDirectiveNoFileComp