Remove deprecated code after the 1.5 release

[carmocca]

Proposed refactoring or deprecation

Remove deprecated code after the 1.5 release

Pitch

All the deprecated features we have are tested here

https://github.com/PyTorchLightning/pytorch-lightning/blob/master/tests/deprecated_api/test_remove_1-6.py

If you are interested in taking care of one item, post a comment here asking to take it. This avoids multiple people working on the same thing.

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[puhuk]

Can I take this :)

trainer_model_hook_mixin

[carmocca]

Seems like @daniellepintz took it already: #10322. Danielle, please write here any you plan to address so others can also participate.

@puhuk feel free to take any other.

[puhuk]

No problem!
Then let me take next one
test_v1_6_0_dataloader_renaming

[daniellepintz]

I will only do the trainer_model_hook_mixin, all the others are up for grabs!

[puhuk]

Let me also take with below.
test_v1_6_0_ddp_spawn_num_nodes()
test_v1_6_0_ddp_spawn_sync_batchnorm()

[rhjohnstone]

I'll do the tiny early_stopping_monitor.