[15.0] Remove deprecated DS_DEFAULT_ANALYZERS variable
## Summary `DS_DEFAULT_ANALYZERS` was deprecated in %14.0 (replaced with `DS_EXCLUDED_ANALYZERS`). It should be removed as well. See deprecation issue: https://gitlab.com/gitlab-org/gitlab/-/issues/287691 ## Improvements - Reduce maintenance burden. - Simplify surface area of supported variables. ## Risks Variable may still be used by users leading to unintended jobs running. ## Involved components - Dependency Scanning template: https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Jobs/Dependency-Scanning.gitlab-ci.yml ## Implementation plan - [x] remove `DS_DEFAULT_ANALYZERS` from [Dependency Scanning template](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/gitlab/ci/templates/Jobs/Dependency-Scanning.gitlab-ci.yml) - [x] remove variable from [Dependency Scanning documentation](https://docs.gitlab.com/ee/user/application_security/dependency_scanning/#available-cicd-variables) - [x] remove variable from analyzers and qa templates: - [x] https://gitlab.com/gitlab-org/security-products/analyzers/gemnasium/-/blob/master/.gitlab-ci.yml - [x] https://gitlab.com/gitlab-org/security-products/analyzers/gemnasium-maven/-/blob/master/.gitlab-ci.yml - [x] https://gitlab.com/gitlab-org/security-products/analyzers/gemnasium-python/-/blob/master/.gitlab-ci.yml - [x] https://gitlab.com/gitlab-org/security-products/ci-templates/raw/master/includes-dev/qa-dependency_scanning.yml
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