Follow based on connection id, disallow chained follows

[ruggi]

Fix #4761

Problem:

Right now it's not possible to follow self on different tabs, because the follow logic only takes the player ID into account.
Also, we should not allow chained follows.

Fix:

Include the connection ID into the follow logic calculations, and keep it in the editor mode. Also, simplify the canFollowTarget logic so that it only allows direct follows and prevent from following users that are already following another user.

[github-actions]

Try me

[relativeci]

Job #9956: Bundle Size — 62.33MiB (~+0.01%).

86ed505(current) vs 8f5e3ac master#9955(baseline)

Warning

Bundle contains 66 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 regression

	Current Job #9956	Baseline Job #9955
Initial JS	45.52MiB(~+0.01%)	45.52MiB
Initial CSS	0B	0B
Cache Invalidation	20%	19.88%
Chunks	26	26
Assets	30	30
Modules	4392	4392
Duplicate Modules	474	474
Duplicate Code	30.74%	30.74%
Packages	462	462
Duplicate Packages	65	65

Bundle size by type   1 change 1 regression

	Current Job #9956	Baseline Job #9955
JS	62.32MiB (~+0.01%)	62.32MiB
HTML	11.54KiB	11.54KiB

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View job #9956 report View feat/follow-target-conn-id branch activity View project dashboard

[github-actions]

Performance test results: