Refactor Workflow Execution Jobs codeflow

[JeffreyThiessen]

What does this PR do and why?

Describe in detail what your merge request does and why.
Continues work started in #1163
Cleans up the flow of code so that jobs that receive a false return value from services handle the errors correctly.
Adds tests that were missed when the jobs were originally created.

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[github-actions]

Code Metrics Report

Coverage	Test Execution Time
96.3%	16m23s

Code coverage of files in pull request scope (93.2%)

Files	Coverage
app/controllers/concerns/workflow_execution_actions.rb	94.3%
app/jobs/workflow_execution_cancelation_job.rb	66.6%
app/jobs/workflow_execution_cleanup_job.rb	100.0%
app/jobs/workflow_execution_completion_job.rb	90.0%
app/jobs/workflow_execution_job.rb	84.6%
app/jobs/workflow_execution_preparation_job.rb	90.9%
app/jobs/workflow_execution_status_job.rb	92.0%
app/jobs/workflow_execution_submission_job.rb	95.0%
app/services/workflow_executions/cancelation_service.rb	100.0%
app/services/workflow_executions/cleanup_service.rb	100.0%
app/services/workflow_executions/completion_service.rb	95.2%
app/services/workflow_executions/preparation_service.rb	95.2%
app/services/workflow_executions/status_service.rb	100.0%
app/services/workflow_executions/submission_service.rb	100.0%

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Reported by octocov