[JetBrains Backend Plugin] Update the Terminal Widget title whenever there's a change on the title from Gitpod Task Terminal

[felladrin]

Currently, we sometimes see terminal widgets set with the wrong title when they are attached to Gitpod Task Terminals.

To implement it we can use a StreamObserver for ListenTerminalResponse, which provides us title changes from Gitpod Tasks Terminals:

gitpod/components/ide/jetbrains/backend-plugin/src/main/kotlin/io/gitpod/jetbrains/remote/GitpodTerminalService.kt

Lines 225 to 229 in 8f4543d

	object : StreamObserver<TerminalOuterClass.ListenTerminalResponse> {
	override fun onNext(response: TerminalOuterClass.ListenTerminalResponse) {
	when {
	response.hasTitle() -> {
	debug("Received terminal title: ${response.title}")