test(document): enable and fix skipped pathsToSkip test

[Divyapahuja31]

Summary

This PR enables a test case for Model.validate() with the pathsToSkip option that was previously skipped with a "TODO" comment.

The test was originally skipped because the implementation was incorrect; it attempted to await User.validate() without catching the rejected Promise that occurs during a validation error. This caused the test to crash instead of asserting the error contents.

I have updated the test to correctly handle the Promise rejection and assert that the correct validation errors are returned, verifying that the pathsToSkip feature works as intended for Model.validate().

Examples

Before (Skipped):

it.skip('support `pathsToSkip` option for `Model.validate()`', async function() {
  const User = getUserModel();
  const err1 = await User.validate({}, { pathsToSkip: ['age'] });
  assert.deepEqual(Object.keys(err1.errors), ['name']);
});

After (Enabled & Fixed):

it('support `pathsToSkip` option for `Model.validate()`', async function() {
  const User = getUserModel();
  const err1 = await User.validate({}, { pathsToSkip: ['age'] }).then(() => null, err => err);
  assert.deepEqual(Object.keys(err1.errors), ['name']);
  
  const err2 = await User.validate({}, { pathsToSkip: ['name'] }).then(() => null, err => err);
  assert.deepEqual(Object.keys(err2.errors), ['age']);
});

[AbdelrahmanHafez]

The test file has so many unrelated formatting changes that make it really difficult to review, can you please revert these changes?

[Divyapahuja31]

apologies for the unrelated formatting changes in the previous commit, i have fixed that formatting changes now it will be much easier to review it

[AbdelrahmanHafez]

LGTM, thanks! 👍

[vkarpov15]

Thanks 👍