Remove old sign-in gate tests (#14930)

Author: tomrf1

dotcom-rendering/src/components/SignInGate/signInGateMappings.ts

@@ -1,20 +1,14 @@
 import type { ABTest } from '@guardian/ab-core';
 import { abTestTest } from './tests/ab-test-test';
-import { auxiaSignInGate } from './tests/auxia-sign-in-gate';
 import { noAuxiaSignInGate } from './tests/no-auxia-sign-in-gate';
 import { personalisedHighlights } from './tests/personalised-highlights';
-import { signInGateMainControl } from './tests/sign-in-gate-main-control';
-import { signInGateMainVariant } from './tests/sign-in-gate-main-variant';
 import { userBenefitsApi } from './tests/user-benefits-api';
 
 // keep in sync with ab-tests in frontend
 // https://github.com/guardian/frontend/tree/main/static/src/javascripts/projects/common/modules/experiments/ab-tests.ts
 export const tests: ABTest[] = [
 	abTestTest,
-	signInGateMainVariant,
-	signInGateMainControl,
 	userBenefitsApi,
-	auxiaSignInGate,
 	personalisedHighlights,
 	noAuxiaSignInGate,
 ];