fix(cdn-log-delivery): remove client-side externalId tests after server-side derivation

externalId is now derived server-side from the site's IMS org id (resolveConnectorExternalId),
so the client no longer supplies it. Remove the two tests that expected a 400 when externalId
was absent from the request body, and align the imsOrgId assertion with TEST_IMS_ORG_ID.

Introduced by: N/A
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: cboldis

test/controllers/llmo/llmo-cloudfront.test.js

@@ -2296,7 +2296,7 @@ describe('LlmoCloudFrontController', () => {
       expect(callArgs.provider).to.equal('cloudfront');
       expect(callArgs.resourceId).to.equal('E2EXAMPLE123');
       expect(callArgs.accountId).to.equal('120569600543');
-      expect(callArgs.imsOrgId).to.equal('ABC123@AdobeOrg');
+      expect(callArgs.imsOrgId).to.equal(TEST_IMS_ORG_ID);
       expect(callArgs.deliveryDestinationArn).to.equal(
         'arn:aws:logs:us-east-1:111122223333:delivery-destination:cdn-logs-org',
       );
@@ -2327,16 +2327,6 @@ describe('LlmoCloudFrontController', () => {
       expect((await result.json()).message).to.include('12-digit');
     });
 
-    it('returns 400 when the external id is missing', async () => {
-      const result = await controller.enableCdnLogDelivery({
-        ...logDeliveryContext,
-        data: { accountId: '120569600543', distributionId: 'E2EXAMPLE123' },
-      });
-
-      expect(result.status).to.equal(400);
-      expect((await result.json()).message).to.include('externalId');
-    });
-
     it('returns 400 when the distribution id is missing', async () => {
       const result = await controller.enableCdnLogDelivery({
         ...logDeliveryContext,
@@ -2540,16 +2530,6 @@ describe('LlmoCloudFrontController', () => {
       expect((await result.json()).message).to.include('12-digit');
     });
 
-    it('returns 400 when the external id is missing', async () => {
-      const result = await controller.rescanCdnLogDelivery({
-        ...rescanContext,
-        data: { accountId: '120569600543' },
-      });
-
-      expect(result.status).to.equal(400);
-      expect((await result.json()).message).to.include('externalId');
-    });
-
     it('returns 500 when the destination account is not configured (server misconfig)', async () => {
       const result = await controller.rescanCdnLogDelivery({ ...rescanContext, env: {} });