Add a universal service version number

Registered by Dan Smith

The proposed change is adding a version number column to the services
table. Each service will report its version number when it updates its
service record. We will be able to determine if all services are on
the same level of code by checking to see if there is more than one
version in the table (optionally grouped by service). We can use this
information to conditionally enable online data migrations.

Blueprint information

Status:
Complete
Approver:
John Garbutt
Priority:
Medium
Drafter:
Dan Smith
Direction:
Approved
Assignee:
Dan Smith
Definition:
Approved
Series goal:
Accepted for liberty
Implementation:
Implemented
Milestone target:
milestone icon 12.0.0
Started by
John Garbutt
Completed by
John Garbutt

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