Don't attempt auth in `auth profiles --skip-validate` (#1282)

This makes the command almost instant, no matter how many profiles cfg
file has. One downside is that we don't set AuthType for profiles that
don't have it defined.

We can technically infer AuthType based on ConfigAttributes tags, but
their names are different from the names of actual auth providers (and
some tags cover multiple providers at the same time).

cmd/auth/profiles.go

@@ -3,7 +3,6 @@ package auth
 import (
 	"context"
 	"fmt"
-	"net/http"
 	"os"
 	"sync"
 	"time"
@@ -45,13 +44,7 @@ func (c *profileMetadata) Load(ctx context.Context, skipValidate bool) {
 	}
 
 	if skipValidate {
-		err := cfg.Authenticate(&http.Request{
-			Header: make(http.Header),
-		})
-		if err != nil {
-			return
-		}
-		c.Host = cfg.Host
+		c.Host = cfg.CanonicalHostName()
 		c.AuthType = cfg.AuthType
 		return
 	}

cmd/auth/profiles_test.go

@@ -21,8 +21,9 @@ func TestProfiles(t *testing.T) {
 	err := databrickscfg.SaveToProfile(ctx, &config.Config{
 		ConfigFile: configFile,
 		Profile:    "profile1",
-		Host:       "https://abc.cloud.databricks.com",
+		Host:       "abc.cloud.databricks.com",
 		Token:      "token1",
+		AuthType:   "pat",
 	})
 	require.NoError(t, err)