Bump version to 7.25.0

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/compare/v7.24.6...1ecc81176139b8506bdbe09c5dabad6b6959dff9

• Release notes:

### New scenarios and scenario updates

- !894 Add Registry with CDN scenario
- !896 Add test data seed step to gitlab component
- !904 Update `--seed-db` option to include file search pattern
- !909 Add Staging Ref Geo scenario

### Fixes

- !905 Fixes for version change, tag pipelines and parent pipeline results

### Other changes (CI, backstage)

- !897 Allow registry_with_cdn jobs to fail
- !880 Switch to using dynamic child pipelines
- !907 Parallelise object storage packages scenarios

• Checklist before merging:

  • Diff link is up-to-date.
  • Based on the diff, lib/gitlab/qa/version.rb is updated, according to SemVer.
  • Release notes are accurate.

• Checklist after merging:

  • Update the release notes for the newly created tag.