fix: Return encryptedAPKAMSymmetricKey in enroll list

[sitaram-kalluri]

- What I did

• Fixes the issue encryptedAPKAMSymmetric key is missed when the pending enrollments are fetched. #1821

- How I did it

• Add encryptedAPKAMSymmetricKey in the EnrollDataStoreValue and store encryptedAPKAMSymmetricKey.
• When enroll:list is executed, fetch the EnrollDataStoreValue of each enrollment which contains the encryptedAPKAMSymmetricKey

- How to verify it

• Added unit and functional test to verify enroll:list contains encryptedAPKAMSymmetricKey

- Description for the changelog

• Return encryptedAPKAMSymmetricKey in enroll list