Do not trigger CASE session setup

[pan-apple]

Problem

The repeated CASE Session setup causes device to run out of heap.

Change overview

The CASEServer code needs to detect duplicate sessions and free the older one, before setting up the new session. Currently, the repeated sessions are causing the device to hold on to the older session, while a new one gets setup.

This PR removes the trigger to setup CASE session, as it's not needed for TE3.

Reference: #7235

Testing

Tested using Python controller and iOS CHIPTool app.

[todo]

- Enable CASE Session setup before message is sent to a fully provisioned device

connectedhomeip/src/controller/CHIPDevice.cpp

Lines 427 to 435 in 7243b18

	// TODO - Enable CASE Session setup before message is sent to a fully provisioned device
	// if (IsProvisioningComplete())
	// {
	// err = EstablishCASESession();
	// SuccessOrExit(err);
	// }
	exit:

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This comment was generated by todo based on a TODO comment in 7243b18 in #7237. cc @pan-apple.