add tech support role to allowed roles when sending an invite

[megahirt]

This fixes a bug where a tech support user cannot add/invite another user

Fixes #1834

Description

Looks like the tech support role was left off the list of allowed roles to send an invite.

Checklist

• I have labeled my PR with: bug, feature, engineering, security fix or testing
• I have performed a self-review of my own code
• I have reviewed the title & description of this PR which I will use as the squashed PR commit message
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have enabled auto-merge (optional)

Testing

Verify that the repro steps in the bug report show no error message

[github-actions]

Unit Test Results

362 tests   362 ✅  14s ⏱️
 37 suites    0 💤
  1 files      0 ❌

Results for commit 062c7e3.

[myieye]

LGTM 🥳