test: remove serverless from run on requirements

Author: durran

test/tools/unified-spec-runner/schema.ts

@@ -106,7 +106,6 @@ export const TopologyName = Object.freeze({
 
 export type TopologyName = (typeof TopologyName)[keyof typeof TopologyName];
 export interface RunOnRequirement {
-  serverless?: 'forbid' | 'allow' | 'require';
   auth?: boolean;
   authMechanism?: string;
   maxServerVersion?: string;