Add Dependency Scanning to scan profile advanced configuration

What does this MR do and why?

Add Dependency Scanning scan profile variables

Add DEPENDENCY_SCANNING_VARIABLE_DEFINITIONS to variable_definitions.js
and register it in VARIABLE_DEFINITIONS_BY_SCAN_TYPE. Each entry mirrors
a field of SecurityScanProfileDependencyScanningConfigurationInput and
takes its envVar from the dependency_scanning block of CiVariables.

Edit the Int fields as text and disabledResolutionJobs as a string
list, so the existing value editors cover every field.

Give every text field an example placeholder, as the SAST fields have.

Related to https://gitlab.com/gitlab-org/gitlab/-/work_items/634032

References

• backend MR that pushes the feature flag: Push Dependency Scanning scan profile flag (!262538 - merged)

Screenshots or screen recordings

Before (or feature flag disabled)	After (feature flag enabled)
no Manage profiles for Dependency Scanning	Manage profiles opens advanced configuration for Dependency Scanning profiles

How to set up and validate locally

0. git checkout 634032-manage-dependency-scanning-in-scan-profile-advanced-configuration

1. have a GitLab Ultimate licence
2. enable the custom_scan_profiles_dependency_scanning_ui feature flag (in caproni or gdk)
3. go to a group => Secure => Security configuration
4. check that Dependency Scanning has a Manage profiles button
5. create a Dependency Scanning profile, and add a few variables of each kind:
   • a text field, such as Max depth
   • a list, such as Disabled resolution jobs
   • a yes/no field and a dropdown, such as the log level
6. save, reopen the profile, and check that every value comes back as entered
7. clear Max depth with the keyboard and save:
   • the save should succeed
   • Max depth should be gone when you reopen the profile
8. disable the feature flag and check that the Dependency Scanning Manage profiles button is gone

to run tests

yarn jest ee/spec/frontend/security_configuration/components/scan_profiles/ ee/spec/frontend/security_configuration/graphql/scan_profiles/

MR acceptance checklist

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Related to #634032