Fix an issue where a describe block will prevent a beforeEach call from executing

[jshayes]

What:

• Bug Fix
• New Feature

Description:

This PR fixes an issue where a describe block will prevent a parent describe block or a before each call from applying. This is due to the describing string being statically stored and set to null in the destructor. For example

describe('outer', function () {
    beforeEach(function () {});

    test('test1', function () {});

    describe('nested', function () {});

    test('test2', function () {});
});

The this example, the before each call will execute for test1 but not for test2. Also, the parent describe is not applied to test2. The following is the test output before and after this change

Before

string(11) "before each"

WARN  Text
! outer → test1 → This test did not perform any assertions
! test2 → This test did not perform any assertions

Tests:    2 risky (0 assertions)

After

string(11) "before each"
string(11) "before each"

WARN  Tests\Feature\TechnicianCapacityOverviewReportTest
! outer → test1 → This test did not perform any assertions
! outer → test2 → This test did not perform any assertions

Tests:    2 risky (0 assertions)