Added modality specific rejectors

[tznind]

Proposed Changes

This PR addresses #687

Added ModalitySpecificRejectors

For example:

ModalitySpecificRejectors:
       - Modalities: SR
         Overrides: true
         RejectorType: Microservices.CohortExtractor.Execution.RequestFulfillers.RejectNone

Note that the Overrides property will override ALL rules including 'opt out' style rules. So we may want instead to move the dynamic rejector we currently have (throws out non PRIMARY / non SECONDARY) to be the modality specific on CT,MR,DX etc

Types of changes

What types of changes does your code introduce? Tick all that apply.

• Bugfix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that would cause existing functionality to not work as expected)
• Documentation-Only Update (if none of the other choices apply)
  • In this case, ensure that the message of the head commit from the source branch is prefixed with [skip ci]

Checklist

By opening this PR, I confirm that I have:

• Reviewed the contributing guidelines for this repository
• Ensured that the PR branch is in sync with the target branch (i.e. it is automatically merge-able)
• Updated any relevant API documentation
• Created or updated any tests if relevant
• Created a news file
  • NOTE: This must include any changes to any of the following files: default.yaml, any of the RabbitMQ server configurations, GlobalOptions.cs
• Listed myself in the CONTRIBUTORS file 🚀
• Requested a review by one of the repository maintainers

Issues

If relevant, tag any issues that are expected to be resolved with this PR. E.g.:

• Closes #<issue-number>
• ...

[lgtm-com]

This pull request introduces 1 alert when merging 86cff47 into a1c3385 - view on LGTM.com

new alerts:

• 1 for Dereferenced variable may be null