pipelines: fix auto-selection in "pipelines run" (#4245)

## Changes
Fix auto-selection in "pipelines run" command.

Previously, if bundle had a job and a pipeline, auto-selection didn't
work because both are considered runnable. This is true, for example,
for lakeflow-pipelines template. It's not intended because "pipelines
run" command should only be applicable to pipelines.

## Why
Fixing not correct behaviour

## Tests
Acceptance tests

Author: kanterov

acceptance/pipelines/run/run-pipeline/databricks.yml

@@ -8,3 +8,7 @@ resources:
       libraries:
         - file:
             path: pipeline_file.py
+  # job is runnable, but doesn't impact auto-selection of pipeline
+  jobs:
+    my_job:
+      name: "My Job"

acceptance/pipelines/run/run-pipeline/output.txt

@@ -4,6 +4,7 @@ Uploading bundle files to /Workspace/Users/[USERNAME]/.bundle/test-pipeline-run/
 Deploying resources...
 Updating deployment state...
 Deployment complete!
+View your job my_job here: [DATABRICKS_URL]/jobs/[NUMID]?o=[NUMID]
 View your pipeline my_pipeline here: [DATABRICKS_URL]/pipelines/[UUID]?o=[NUMID]
 
 === Run pipeline

cmd/pipelines/run.go

@@ -351,7 +351,7 @@ Refreshes all tables in the pipeline unless otherwise specified.`,
 		}
 
 		if len(args) == 0 {
-			completions := bundleresources.Completions(b, run.IsRunnable)
+			completions := bundleresources.Completions(b, isPipeline)
 			return maps.Keys(completions), cobra.ShellCompDirectiveNoFileComp
 		} else {
 			// If we know the resource to run, we can complete additional positional arguments.

cmd/pipelines/utils.go

@@ -42,12 +42,10 @@ func promptResource(ctx context.Context, b *bundle.Bundle, filters ...resources.
 // autoSelectSinglePipeline checks if there's exactly one pipeline resource in the bundle and returns its key.
 // Returns empty string if there's not exactly one pipeline.
 func autoSelectSinglePipeline(b *bundle.Bundle) string {
-	completions := resources.Completions(b, run.IsRunnable)
+	completions := resources.Completions(b, isPipeline)
 	if len(completions) == 1 {
-		for key, ref := range completions {
-			if _, ok := ref.Resource.(*configresources.Pipeline); ok {
-				return key
-			}
+		for key := range completions {
+			return key
 		}
 	}
 	return ""
@@ -334,3 +332,12 @@ func fetchPipelineUpdates(ctx context.Context, w *databricks.WorkspaceClient, st
 
 	return updates, nil
 }
+
+func isPipeline(ref resources.Reference) bool {
+	switch ref.Resource.(type) {
+	case *configresources.Pipeline:
+		return true
+	default:
+		return false
+	}
+}