Export migration stats

[Rohit-PX]

What type of PR is this? integration-test

What this PR does / why we need it:

• For every migration that runs in integration test, we aim to push the migration stats to Aetos DB (MongoDB)
• These stats can then later be used to generate performance/statistical reports for the migrations

Does this PR change a user-facing CRD or CLI?: no

Is a release note needed?: no

Does this change need to be cherry-picked to a release branch?: 2.12

[cnbu-jenkins]

Can one of the admins verify this patch?