fix: Add transporterOptions when serviceAccountPathOrObject parameter is a object in admin.credential.cert()

[FTD-YI]

Discussion

To fix the issue: https://github.com/firebase/firebase-admin-node/issues/2960.

Testing

All tests passed.

API Changes

No Changes.

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[FTD-YI]

Please review. @jonathanedey @lahirumaramba @DellaBitta

[edward-s]

We encountered this issue, can this be merged and be included in the next release?