Remove unused `type` parameter from functions supplied to decorators in tests and sample code. This resolves 477 eslint unused var warnings.
All changes are modifying functions in test or sample code of the following style:
1. `@OneToMany((type) => Entity, ...)` to `@OneToMany(() => Entity)`
2. `@ManyToOne((type) => Entity, ...)`
3. `@ManyToMany((type) => Entity, ...)`
4. `@OneToOne((type) => Entity, ...) `
Note that we don't actually ever call this function with an argument.
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