LightningCLI instantiator receives values applied by instantiation links to set in hparams

[mauvilsa]

What does this PR do?

Fixes save_hyperparameters when used through LightningCLI (feature introduced in #18105) so that target values of links applied for instantiation are included in hparams.

Fixes #20311
Fixes #20147

Also adds an official way to disable #18105 (parameter load_from_checkpoint_support), which might be desired by some people, e.g #20432, #20726

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📚 Documentation preview 📚: https://pytorch-lightning--20777.org.readthedocs.build/en/20777/

[mauvilsa]

I think the tests that fail is because the newer version of jsonargparse is not installed.