Use v2 template by default for DS in Scan Execution Policies
<!-- Implementation issues are used break-up a large piece of work into small, discrete tasks that can move independently through the build workflow steps. They're typically used to populate a Feature Epic. Once created, an implementation issue is usually refined in order to populate and review the implementation plan and weight. Example workflow: https://about.gitlab.com/handbook/engineering/development/threat-management/planning/diagram.html#plan --> ## Why are we doing this work <!-- A brief explanation of the why, not the what or how. Assume the reader doesn't know the background and won't have time to dig-up information from comment threads. --> Today, when a user enforces Dependency Scanning through a Scan Execution Policy, the v1 (legacy) template is included by default. To complete the GA rollout of the new DS analyzer, SEP-enforced scans must also default to the v2 template so customers using policies benefit from the new analyzer without manual intervention. ### Acceptance criteria - [ ] When a Scan Execution Policy with a `dependency_scanning` action is applied, the v2 DS template is included by default. - [ ] Existing policies continue to work without breaking changes (backward compatibility verified). - [ ] Documentation for Scan Execution Policies is updated to reflect the new default if relevant - [ ] Tests cover both v2 default behavior and the fallback path? ## Relevant links <!-- Information that the developer might need to refer to when implementing the issue. - [Design Issue](https://gitlab.com/gitlab-org/gitlab/-/issues/<id>) - [Design 1](https://gitlab.com/gitlab-org/gitlab/-/issues/<id>/designs/<image>.png) - [Design 2](https://gitlab.com/gitlab-org/gitlab/-/issues/<id>/designs/<image>.png) - [Similar implementation](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/<id>) --> ## Non-functional requirements <!-- Add details for required items and delete others. --> - [ ] Documentation: - [ ] Feature flag: - [ ] Performance: - [ ] Testing: ## Implementation plan <!-- Steps and the parts of the code that will need to get updated. The plan can also call-out responsibilities for other team members or teams and can be split into smaller MRs to simplify the code review process. e.g.: - MR 1: Part 1 - [ ] ~frontend Step 1 - [ ] ~frontend Step 2 - MR 2: Part 2 - [ ] ~backend Step 1 - [ ] ~backend Step 2 - MR 3: Part 3 - [ ] ~frontend Step 1 - [ ] ~frontend Step 2 --> <!-- Workflow and other relevant labels # ~"group::" ~"Category:" ~"GitLab Ultimate" Other settings you might want to include when creating the issue. # /assign @ # /epic & --> ## Verification steps <!-- Add verification steps to help GitLab team members test the implementation. This is particularly useful during the MR review and the ~"workflow::verification" step. You may not know exactly what the verification steps should be during issue refinement, so you can always come back later to add them. 1. Check-out the corresponding branch 1. ... 1. Profit! -->
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