update ModelSummary

[YChienHung]

What does this PR do?

Fixes #20944

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📚 Documentation preview 📚: https://pytorch-lightning--20945.org.readthedocs.build/en/20945/

[YChienHung]

@Borda Hi,Borda, is there a problem with my design ?

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[Borda]

Let's first clarify what the desired state is #20944 (comment)

[Borda]

Suggested change

	# modes = [
	# (
	# (ModelSummaryTrainingMode.TRAIN if layer.training else ModelSummaryTrainingMode.EVAL)
	# if any(p.requires_grad for p in layer.parameters())
	# else ModelSummaryTrainingMode.FREEZE
	# ).value
	# for layer in islice(self._model.modules(), 1, None) # exclude the root module
	# ]
	# return {
	# "train": modes.count(ModelSummaryTrainingMode.TRAIN.value),
	# "eval": modes.count(ModelSummaryTrainingMode.EVAL.value),
	# "freeze": modes.count(ModelSummaryTrainingMode.FREEZE.value),
	# }

is it needed?