chore: clean up type tests

[mrazauskas]

What?

This PR removes unnecessary asType() helper and typeof in type tests.

Why?

An expression or a type can be passed to both sides of TSTyche assertions. The following are equivalent; the redundant syntax can be removed improving the readability.

- expect(asType<JoinQuery<'pages'>>()).type.toBe<never>()
+ expect<JoinQuery<'pages'>>().type.toBe<never>()

- expect<(typeof user)['collection']>().type.toBe<'users'>()
+ expect(user.collection).type.toBe<'users'>()

[mrazauskas]

Here I also swapped sides of assertion and used toBeAssignableTo(). So it reads exactly as the test title and type under test stays on the left.

[AlessioGr]

Thank you!

[mrazauskas]

@AlessioGr Thanks from sponsoring! I am glad to see TSTyche is useful at @payloadcms.