[INTERNAL] RDS-1527: changing defaults so that model params and blueprints match

[andreatgretel]

1. num_records is always 1000 in all task defaults; in param defaults, it is 5000 for TabFT/TabGAN and 10 for TextFT. Recommendation - set param defaults to 1000 in all cases (this might be slow for TextFT though!)
2. for TextFT, steps is 750 for the task default; in param defaults, both steps and epochs are empty. I think this is fine - we need to be opinionated about some params in task default, but not necessarily in param defaults
3. for TextFT, generate.maximum_text_length is 100 in task default and 42 in param default. Also, train.max_tokens is 512 in param default (and empty in task default). Recommendation - set all of these to 128. This is still relatively short, but at least wouldn't affect runtime too much.
4. for TabGAN, there's a mismatch in almost all parameters: generator_dim and discriminator_dim are 1024x1024 in task and 256x256 in param; generator_lr and discriminator_lr are 2e-4/2e-4 in task and 1e-4, 3.3e-4 in param; epochs is auto in task and 600 in param; batch_size is auto in task and 500 in param. Recommendation - make params all equal to task.

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