No need to verify existence of search related to search job

[luk-kaminski]

Description

No need to verify existence of search related to search job.
/nocl

Motivation and Context

FE does not use search ID stored in search job to fetch a search.
Each execution results in the creation of a new search.
Even if the search job is linked to a search that is gone, we should not take any immediate actions, throw exceptions etc.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.