Remove unnecessary GET call in pipeline runner (#1850)

## Changes
This GET API call is unnecessary and serves no purpose. Let's remove it.
Noticed this when I was adding a unit test for the pipeline runner here:
#1849

## Tests
Manually. 

### Case 1: The pipeline does not exist

Before:
```
➜  my_project git:(master) ✗ databricks bundle run my_project_pipeline -p dogfood
Error: User [email protected] does not have View permissions on pipeline 9941901a-e48b-4d04-b6ba-e0072ad126bg.
```

After:
```
➜  my_project git:(master) ✗ cli bundle run my_project_pipeline -p dogfood
Error: User [email protected] does not have Run permissions on pipeline 9941901a-e48b-4d04-b6ba-e0072ad126bg.
```

### Case 2: Pipeline exists

Before:
```
➜  my_project git:(master) ✗ databricks bundle run my_project_pipeline -p dogfood --restart
Update URL: https://e2-dogfood.staging.cloud.databricks.com/#joblist/pipelines/9941901a-e48b-4d04-b6ba-e0072ad126bf/updates/0f988d62-9ec7-49f1-b429-5572ece3a9aa

2024-11-18T15:30:36.054Z update_progress INFO "Update 0f988d is WAITING_FOR_RESOURCES."
```

After:
```
➜  my_project git:(master) ✗ cli bundle run my_project_pipeline -p dogfood --restart
Update URL: https://e2-dogfood.staging.cloud.databricks.com/#joblist/pipelines/9941901a-e48b-4d04-b6ba-e0072ad126bf/updates/87b43350-6186-4a9b-9d0e-38da2ecf33ae

2024-11-18T15:28:27.144Z update_progress INFO "Update 87b433 is WAITING_FOR_RESOURCES."
```

bundle/run/pipeline.go

@@ -90,11 +90,6 @@ func (r *pipelineRunner) Run(ctx context.Context, opts *Options) (output.RunOutp
 	// Include resource key in logger.
 	ctx = log.NewContext(ctx, log.GetLogger(ctx).With("resource", r.Key()))
 	w := r.bundle.WorkspaceClient()
-	_, err := w.Pipelines.GetByPipelineId(ctx, pipelineID)
-	if err != nil {
-		log.Warnf(ctx, "Cannot get pipeline: %s", err)
-		return nil, err
-	}
 
 	req, err := opts.Pipeline.toPayload(r.pipeline, pipelineID)
 	if err != nil {

bundle/run/pipeline_test.go

@@ -90,8 +90,6 @@ func TestPipelineRunnerRestart(t *testing.T) {
 		PipelineId: "123",
 	}).Return(mockWait, nil)
 
-	pipelineApi.EXPECT().GetByPipelineId(mock.Anything, "123").Return(&pipelines.GetPipelineResponse{}, nil)
-
 	// Mock runner starting a new update
 	pipelineApi.EXPECT().StartUpdate(mock.Anything, pipelines.StartUpdate{
 		PipelineId: "123",