Delete default encryption key and default self encryption key when deleting the enrollment key.

[sitaram-kalluri]

Describe the bug

• When an enrollment is approved, the default encryption key and default self encryption key are creating. When deleting the enrollment revoked enrollment, only the enrollment key is deleted, but the default encryption key and default self encryption key are not deleted. After deleting the enrollment key, these key are of no use. Delete these keys also.

Adding the log:

Before enrollment key deletion:
-----------------------------------------------
@alice🛠@scan
data:["19f571bb-25a7-409d-80cb-984f2bc882a6.default_enc_private_key.__manage@alice🛠","19f571bb-25a7-409d-80cb-984f2bc882a6.default_self_enc_key.__manage@alice🛠","19f571bb-25a7-409d-80cb-984f2bc882a6.new.enrollments.__manage@alice🛠"]

After enrollment key deletion:
-----------------------------------------------
@alice🛠@scan
data:["19f571bb-25a7-409d-80cb-984f2bc882a6.default_enc_private_key.__manage@alice🛠","19f571bb-25a7-409d-80cb-984f2bc882a6.default_self_enc_key.__manage@alice🛠"]
@alice🛠@

Steps to reproduce

1. Create an enrollment request.
2. Approve the enrollment request
3. Then revoke the enrollment request
4. Delete the revoked enrollment request
5. The enrollment key is successfully deleted. The default self encryption key and default encryption key still exist in the keystore which are of no use.

Expected behavior

Delete the default encryption key and default self encryption key related to the enrollment.