fix: get rid of the connectionToken parameter

[benoitf]

Che is securing the route so we don't need connectionToken parameter
It's now possible to turn off this feature in VS Code

it might fix eclipse-che/che#21099 as the gateway can know check if the server is returning 200 and it's no longer returns 403 error

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[benoitf]

so while it's getting rid of the connectionToken I still have bad gateway issue

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