EA-116084 Raise Python debugger connection time out exception earlier than the late precondition check

`TextMergeViewer.MyInnerDiffWorker.launchRediff()` uses `isRunning()` flag
to check that callback was not performed synchronously.

Prior to this fix, `indicator.start()` was called by `runProcess()`
on pooled thread, causing data race.

Ensure that callback from `MyInnerDiffWorker` will not access `MergeModelBase`
after it has been disposed (causing AIOOB exception).

`ApplicationInfoImpl.getShadowInstance().getPluginManagerUrl()` allows configuring server url for testing and customization purposes

@davdeev is agreed

also additional test added

see the original issue - IDEA-103199 Undo: UTF problem

Wrap checked exceptions in TTransportException in TNettyClientTransport.open() to follow signature of the base method

PY-32247 Response with KeyboardInterruptException in Python Console's requestInput() when hitting Ctrl+C in the IDE

PY-32147 Fix hanging of the IDE after clicking on Stop button when connection to Python console process is impossible

Do not use `PydevConsoleCommunication.interrupt()` because it locks up until Python console backend client is available, i.e. the connection to Python console process is established.