Add redirection for specific legacy URLs

The endpoints of the old system are referenced from many places and it is better that instead of just ending on a 404 the user get redirected to the corresponding page (with a notification).

Endpoints to support:

• /<flavour>/summary/
• /<flavour>/<slot>/build/<build_id>/
• /logs/checkout/<flavour>/<slot>/<build_id>/<project>/
• /logs/build/<flavour>/<slot>/<build_id>/<platform>/<project>/
• /logs/tests/<flavour>/<slot>/<build_id>/<platform>/<project>/