Update Configuration UI to support enabling IaC - Frontend

Why are we doing this work

With the introduction of IaC Security Testing (name subject to change), we are letting users configure the job via the Security Configuration page. The MVC involves showing a Configure via Merge Request button.

Relevant links

• Similar implementation

Implementation plan

• Create the configure_iac_scanning_via_mr feature flag.
• Create the client-side GraphQL mutation.
• Add the scanner to the featureToMutationMap in ee/app/assets/javascripts/security_configuration/components/constants.js.
• Add the scanner to the securityFeatures array in app/assets/javascripts/security_configuration/components/constants.js.