CI: Add test with 4 DL layers, 60 MHz BW to SA-2x2 pipeline

Create a new test scenario with USRP N310, 60 MHz bandwidth, 4 DL layers and 2 UL layers. Test 480 Mbps DL and 120 Mbps UL.

Sample run in CI:

• https://jenkins-oai.eurecom.fr/job/RAN-SA-2x2-Module-CN5G/1761/ - OK
• https://jenkins-oai.eurecom.fr/job/RAN-SA-2x2-Module-CN5G/1762/ - issue with [HW] W Buffer overflow
• https://jenkins-oai.eurecom.fr/job/RAN-SA-2x2-Module-CN5G/1763/ - OK
• https://jenkins-oai.eurecom.fr/job/RAN-SA-2x2-Module-CN5G/1764/ - OK
• https://jenkins-oai.eurecom.fr/job/RAN-SA-2x2-Module-CN5G/1765/ - OK