remove pause action from chat view

[isidorn]

fixes #252271

[isidorn]

Tried it out of OSS, and seems to work

[connor4312]

We can also get rid of the ChatContextKeys.isRequestPaused context key and the downstream methods used here

			this.lastRequest.response.setPaused(pausedValue);
			this.chatAgentService.setRequestPaused(this.lastRequest.response.agent.id, this.lastRequest.id, pausedValue);