Description of the problem:
Tests must be executed as well for maintenance branches.
If we keep using the same jobs for maintenance, the folder prefix needs to be adjusted.

Desired outcome and acceptance tests:

• P2 jobs are adjusted for maintenance branches (list below) and symlinked
• If applicable, job names are generated with a maintenance/<version>/ prefix.
• There are no collisions with non-maintenance jobs, e.g. data-generating or consuming jobs for master.

Hints (optional):

• Ideally, a shared-library function is used for prefixing the job name.
• Pay attention to references to master
• Jobs which generate or consume data using Google Buckets need to use a path prefix as well.

P2 jobs:

• .ci/jobs/query_performance.dsl
• .ci/jobs/event_import_performance.dsl
• .ci/jobs/cleanup_data_performance_large.dsl
• .ci/jobs/event_import_performance.dsl
• .ci/jobs/import_large_static_data_performance.dsl
• .ci/jobs/upgrade_data_performance_large.dsl
• .ci/jobs/event_cleanup_performance.dsl