(prototype) Delete the four old SimCLR copies

[gabrielfruet]

Prototype. Do not merge. This is a design exploration for the LightlySSL 2.0
refactor, opened to be read and argued with, not to land on master. The whole
stack goes together or not at all, and the shape is still open.

7 of 7 in a stack. Base: #2038.

Removes the four SimCLR implementations that PR 6 replaces:

examples/pytorch/simclr.py
examples/pytorch_lightning/simclr.py
examples/pytorch_lightning_distributed/simclr.py
benchmarks/imagenet/resnet50/simclr.py

plus their generated notebooks and the METHODS entry in the ResNet-50 runner. dcl.py and dclw.py import SimCLRTransform directly rather than the deleted module, so they keep working.

docs/source/examples/simclr.rst loses its three tabs for one literalinclude of the new example, and gains a section on reproducing a published number.

The README's 63.2 linear and 73.9 kNN came from the file being deleted here, on the run logged as imagenet_resnet50_simclr_2023-06-22_09-11-13. The number stays in the table with a footnote saying which file produced it and that the new benchmark has not reproduced it. benchmarks/simclr/README.md lists the three things that differ: batch size and learning-rate scaling, the online probe's inputs and optimiser, and the kNN probe's lifecycle.

Testing: make generate-example-notebooks produces no diff, and nothing in docs/ or README.md still points at a deleted path.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Remove SimCLR from the old benchmark inventory

After moving SimCLR out of this tree, the Available Benchmarks table still advertises it under resnet50/. Users following that inventory and passing --methods simclr to this README's resnet50/main.py command will get a KeyError, because the SimCLR file was deleted and METHODS no longer contains that key. Update the inventory alongside this move.

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