Refactor migrations that modifiy roles

[david-venhoff]

Motivation

Each time a migration modifies the roles, it runs a copy-pasted chunk of code.

Proposed Solution

Create a common function for this code, and consider running it only once if that is possible

Alternatives

Do nothing

Additional Context

Affected migrations:

• 0025
• 0035
• 0039
• 0043
• 0044
• 0053
• 0056
• 0058

And also the migration of #2895 after it has been merged