[8.x] Allow reporting reportable exceptions with the default logger

[netpok]

Currently there is no way to report a reportable exception with the default handler except manually accessing the logger from the report method (and then the default report context is not available).

This pull request allows this by simply returning false from the report method.

Example:

class MyException extends Exception {
//...
    public function report()
    {
        if ($this->shouldReport()) {
            return false; // this will result in using the original log channels
        }

        $this->doSomethingElse();
    }
//...
}

Furthermore this PR also fixes the following problems in the test:

• Previously the mockery call count was not defined which defaults to 0 or more, resulting in no calls were actually checked
• It adds a check that a reportable is not passed to the default handler (except of course intentionally)
• It adds a missing trait so tests are no longer resulting in "This test did not perform any assertions" warnings.

[mfn]

@netpok good change but this leaves things in a bit inconsistent state

phpdoc still says void: in the method you changed, the contract and it must also be made sure that the laravel/laravel stub handler has the proper phpdocs

Do you think you can take a second look here?

[GrahamCampbell]

I'd vote for this to be reverted. The use case is not convincing. Just override the whole report method in your app if you want custom stuff.

[netpok]

@mfn The contract and the phpdoc does not need to change, since it only checks the return value of the report method of the exception. The report method on the exception handler does not return anything (just as before).

I will look into the stub tomorrow.