[client] Fix profile regressions in up --profile and status (#6479)

* Restores behavior to create profile if not there on Up

* Allows to restore nerbird status showing of the profile name

* [client] Reduce upFunc cognitive complexity

Extract the profile switch/auto-create logic from upFunc into a dedicated
switchOrCreateProfile helper. The inlined NotFound-retry branch pushed
upFunc over SonarCloud's cognitive complexity threshold (S3776).
No behavior change.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* [client] Make up --profile auto-create idempotent under concurrent runs

Don't fail switchOrCreateProfile on a createProfile error: a concurrent
run may create the profile between the NotFound check and our create
call. Retry the switch regardless and only surface the create error if
the switch also fails. Addresses CodeRabbit race-condition feedback.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* Share createProfile with addProfileFunc

* But allow conn reusage

* moves switchOrCreateProfile to where it's used

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/cmd/login.go

@@ -227,7 +227,7 @@ func switchProfile(ctx context.Context, handle string, username string) (profile
 		Username:    &username,
 	})
 	if err != nil {
-		return "", fmt.Errorf("switch profile failed: %v", err)
+		return "", fmt.Errorf("switch profile failed: %w", err)
 	}
 
 	return profilemanager.ID(resp.Id), nil