Draft: Deliver DAST on-demand secrets to builds

What does this MR do?

this merge request builds on the work in !62986 (closed) both by allowing dast secret variables to be delivered to dast ci jobs with yaml configuration that references profiles and by moving variable association to the database.

Example

when you define the variable DAST_SITE_PROFILE or DAST_SCANNER_PROFILE in a job as part of the dast stage in the .gitlab.yml we will look up those records in the database by name and add the calculated variables to the job using DastSiteProfile#ci_variables, DastSiteProfile#secret_ci_variables and DastScannerProfile#ci_variables.

stages:
  - dast
  - test
dast:
  stage: dast
  variables:
    DAST_SITE_PROFILE: site-profile-name
    DAST_SCANNER_PROFILE: scanner-profile-name
  script:
    - env

Why?

we want to give customers the ability to use dast profiles in yaml in order to simplify the configuration of DAST for customers.

Does this MR meet the acceptance criteria?

Conformity

• I have included a changelog entry, or it's not needed. (Does this MR need a changelog?)
• I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.

Availability and Testing

• I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)
• I have tested this MR in all supported browsers, or it's not needed.
• I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.

Security

Does this MR contain changes to processing or storing of credentials or tokens, authorization and authentication methods or other items described in the security review guidelines? If not, then delete this Security section.

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team