feat: Replace useModal with updated Modal component [WEB-1828] [WEB-1891]

[mapmeld]

Description

Use the updated Modal component ( determined-ai/hew#77 ) to replace Checkpoint and HyperparameterSearch modals

The HyperparameterSearch modal is easier; we just send a custom footer and update CSS.

Checkpoint modal has a few issues:

• in latest-main, creating a new model closes the previous form and doesn't register the MV to this new model, so it should be updated
• in some locations the Modal is being redrawn when the table updates
• the model fetch code is moved to the outside, but we would prefer it to be inside the modal code

WEB-1891: hparam max slots can be 0 without flagging an error

Test Plan

• In an experiment, create a new hyperparameter search
• In a completed experiment with checkpoints, register the checkpoint to a model

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

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[julian-determined-ai]

Could we update the footer styling on the hyper parameter search modal so that it is more in line with our usual styling?

[mapmeld]

Oh, that comes from the updates we made to the footer in Hew. Was able to remove some antd and CSS now that we can use the default Hew CSS.

[julian-determined-ai]

@mapmeld

what do we expect to happen when this "New Model" button is pressed?

[mapmeld]

ok I added some callbacks so the Checkpoint Flag -> Register Checkpoint -> New Model -> register to new model works

[julian-determined-ai]

LGTM!