Refactor DAST Profiles to use GraphQL fragments

Related to #357938 (closed)

What does this MR do and why?

This adds DastScannerProfileFragment and DastSiteProfileFragment and refactor existing usages of them.

Screenshots or screen recordings

No user-facing changes except that the mutations now return the profiles object which will be used in subsequent MRs.

How to set up and validate locally

It can be validated by checking that the creation & update operations of DAST profiles (under "Project > Security Configuration" section) are working as usual

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.