Fix RADV launch option validation

[Vysp3r]

Summary

Fixes the launch-option failure reported in #1300.

The RADV performance-test widget was still exposing historical values such as sam, gpl, and ruse, while the semantic catalog only accepts the current Mesa RADV values. In addition, list-valued environment options such as RADV_PERFTEST=nggc,rtcps were being validated as one value instead of validating each comma-separated member.

Changes

• synchronize the RADV performance-test UI with the catalog's supported values
• add explicit separator metadata for list-valued dynamic environment options
• validate each member of comma-separated RADV/ACO/VKD3D option lists
• add regression coverage for valid and invalid multi-value RADV selections
• surface composition diagnostics in Mass Edit instead of falling back immediately to the generic error message

Expected result

Selections such as:

RADV_PERFTEST=nggc,rtcps

can be prepared and applied, while unsupported list members are still rejected with a useful diagnostic.

Fixes #1300