[ado2gh] RewirePipeline - Accept definitionId (int) for ado-pipeline parameter

## Description

Currently, we provide the name or path of the pipeline definition (ado-pipeline) to perform the rewire.

With this value, we look for the definitionId (int) - this is expensive as it is necessary to enumerate all Definitions as the API does not provide a method for this.

```csharp
// removed code for brevity
public virtual async Task GetPipelineId(string org, string teamProject, string pipeline)
{
// Check if we have the pipeline id cached - this will gone after process kill / execution
if (_pipelineIds.TryGetValue((org.ToUpper(), teamProject.ToUpper(), pipelinePath.ToUpper()), out var result))
{
return result;
}

var url = $"{_adoBaseUrl}/{org.EscapeDataString()}/{teamProject.EscapeDataString()}/_apis/build/definitions?queryOrder=definitionNameAscending";

// expensive call
var response = await _client.GetWithPagingAsync(url);
```

To avoid this, the user could have the option to directly pass definitionId - this would avoid unnecessary calls and make the process faster.

The suggestion is to use the same parameter (ado-pipeline) and in the implementation, consider that it is the definitionId if it is a number, otherwise, follow the current process - convenient for those who do not have the definitionId at hand.

```csharp
// removed some code for brevity
public virtual async Task GetPipelineId(string org, string teamProject, string pipeline)
{
// Check if the pipeline is a number - the id itself
if (int.ParseInt(pipeline, out var definitionId)) {
return definitionId;
}

/// continue with the rest of the code
```

It makes sense? If so, I will provide a PR.