fix: delete roles when deleting user

[slowr]

Description of PR

This bug was raised by @pputerla in #410. We now delete the roles when also deleting the user to avoid issues with permissions when a user with same username is being re-registered after deletion.

What component(s) does this PR affect?

• Back-End (Database, Detection/Configuration/etc. Microservices)
• Front-End (Flask, API, UI, etc)
• Monitor (RIPE RIS, BGPStream RV/RIS/CAIDA, etc.)
• Docs (incl. wiki)
• Build System

Does the PR require changes on other components? If yes, please mark the components:

• Back-End (Database, Detection/Configuration/etc. Microservices)
• Front-End (Flask, API, UI, etc)
• Monitor (RIPE RIS, BGPStream RV/RIS/CAIDA, etc.)
• Docs (incl. wiki)
• Build System

Related Issue

Resolves #

Solution

Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Docs update
• None of the above

Checklist:

• I have read the contributing guide and my code conforms to the guidelines.
• This change requires a change in the documentation.
• I have updated the documentation accordingly.

[artemis-pr-bot]

🏃 Benchmark Results 🏃

• RMQ Update inserts: 446/s
• RMQ Hijack inserts: 146/s
• PG Update inserts: 196/s
• PG Update updates: 145/s
• PG Hijack inserts: 145/s

[codecov]

Codecov Report

Merging #412 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #412   +/-   ##
=======================================
  Coverage   90.90%   90.90%           
=======================================
  Files           5        5           
  Lines        1859     1859           
=======================================
  Hits         1690     1690           
  Misses        169      169           

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