[Spark load][Bug] fix that cancelling a spark load in the PENDING phase will not succeed

[xy720]

Proposed changes

To Reproduce
Steps to reproduce the behavior:

1. Submit a spark load job
2. The job state is PENDDING at the beginning.
3. cancel load job.
4. Show load. And you can see the job state is CANCELLED with msg user cancel
5. Open the web interface of the yarn cluster with browser, you can see that the spark job has been submitted successfully and is running well.

Expected behavior
The spark job should not be submmited.

The reson of this Bug
When a user wants to cancel a loadjob in the pending phase, it is possible that the appId in the SparkLoadJob is empty, causing the yarn command to fail, so we need to get the appId through the handle.

If the appId still cannot be get from handle, which means the spark mission hasn't been submitted, the spark launcher process should be killed to prevent the spark mission from being submitted to yarn cluster.

Types of changes

What types of changes does your code introduce to Doris?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have create an issue on (Fix [Spark Load][Bug] Cancelling a spark load in the pending phase will not succeed #4518 ), and have described the bug/feature there in detail
• Compiling and unit tests pass locally with my changes

[morningman]

LGTM