Add force option to POST /jobs/jobId/_stop and POST /ex/exId/_stop endpoints

[busma13]

This PR adds a force option to the POST /jobs/{jobId}/_stop and POST /ex/{exId}/_stop endpoints

• include force='true' as a request parameter to forcefully stop all jobs, deployments, replicaSets and pods labeled with the execution ID in the url or the execution ID associated with the jobID in the url.
• This overrides the default behavior of not allowing a job with a status of 'completed', 'stopped', 'rejected', 'failed', 'terminated', or 'stopping' to be stopped.
• Endpoint documentation updated.
• Adds a test for deleting with force set to true.
• Modifies delete job, service, and deployment tests to expect the complete response, not the response.body.

Ref: #2670

[godber]

I'm going to merge this, no need to add the comments, perhaps in a later PR. Note, I've bumped the Teraslice version to v0.89.0 so I can make a release.