allow balancers to unload rooms

[dyc3]

• add B2MUnload
• refactor how balancer messages are handled

closes #1117

[codecov]

Codecov Report

Merging #1119 (86f807e) into master (1c46815) will decrease coverage by 0.0629%.
The diff coverage is 0.0000%.

@@               Coverage Diff                @@
##             master      #1119        +/-   ##
================================================
- Coverage   59.7810%   59.7181%   -0.0629%     
================================================
  Files           115        115                
  Lines          9498       9508        +10     
  Branches       1133       1130         -3     
================================================
  Hits           5678       5678                
- Misses         3820       3830        +10     

Files	Coverage Δ
server/generated.ts	0.0000% <ø> (ø)
server/clientmanager.ts	21.4574% <0.0000%> (-0.9054%)	⬇️

[cypress]

2 failed tests on run #667 ↗︎

2

63

1

0

0

Details:

Merge 86f807e into 1c46815...
Project: OpenTogetherTube	Commit: 9fdabce024 ℹ️
Status: Failed	Duration: 05:03 💡
Started: Oct 26, 2023 5:11 PM	Ended: Oct 26, 2023 5:16 PM

  RoomSettingsForm.cy.ts • 1 failed test • Component - electron

View Output Video

Test		Artifacts
An uncaught error was detected outside of a test		Output Screenshots Video

  ShareInvite.cy.ts • 1 failed test • Component - electron

View Output Video

Test		Artifacts
An uncaught error was detected outside of a test		Output Screenshots Video

Review all test suite changes for PR #1119 ↗︎