fix: add missing keychain nocks in sendMany multisig test

The 'should ignore commonKeychain param for multisig wallet' test was
missing nock mocks for backup-key-id and bitgo-key-id. The handler
fetches all 3 keychains to build walletPubs for AWM signing, causing
a 500 when the nocks were absent. Also use .times(2) for user-key-id
since it's fetched both as the signing keychain and in the walletPubs
lookup.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: pranavjain97

src/__tests__/api/master/sendMany.test.ts

@@ -1026,12 +1026,29 @@ describe('POST /api/v1/:coin/advancedwallet/:walletId/sendMany', () => {
 
     const keychainGetNock = nock(bitgoApiUrl)
       .get(`/api/v2/${coin}/key/user-key-id`)
+      .times(2)
       .matchHeader('any', () => true)
       .reply(200, {
         id: 'user-key-id',
         pub: 'xpub_user',
       });
 
+    const backupKeychainGetNock = nock(bitgoApiUrl)
+      .get(`/api/v2/${coin}/key/backup-key-id`)
+      .matchHeader('any', () => true)
+      .reply(200, {
+        id: 'backup-key-id',
+        pub: 'xpub_backup',
+      });
+
+    const bitgoKeychainGetNock = nock(bitgoApiUrl)
+      .get(`/api/v2/${coin}/key/bitgo-key-id`)
+      .matchHeader('any', () => true)
+      .reply(200, {
+        id: 'bitgo-key-id',
+        pub: 'xpub_bitgo',
+      });
+
     const prebuildStub = sinon.stub(Wallet.prototype, 'prebuildTransaction').resolves({
       txHex: 'prebuilt-tx-hex',
       txInfo: { nP2SHInputs: 1, nSegwitInputs: 0, nOutputs: 2 },
@@ -1072,6 +1089,8 @@ describe('POST /api/v1/:coin/advancedwallet/:walletId/sendMany', () => {
 
     walletGetNock.done();
     keychainGetNock.done();
+    backupKeychainGetNock.done();
+    bitgoKeychainGetNock.done();
     sinon.assert.calledOnce(prebuildStub);
     sinon.assert.calledOnce(verifyStub);
     signNock.done();