Add billable rate calculation to project member (create/delete)

[korridor]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.28%. Comparing base (7c1b828) to head (2113608). Report is 38 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #145      +/-   ##
============================================
+ Coverage     84.26%   84.28%   +0.02%     
- Complexity      939      941       +2     
============================================
  Files           184      184              
  Lines          5223     5232       +9     
============================================
+ Hits           4401     4410       +9     
  Misses          822      822              

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.