fix: add missing clearLogBuilds

[Sadhorsephile]

Problem

Some tests keep failing with such error:

`buildLogItems` is not empty. Tests should validate the contents of `buildLogItems` and call `clearBuildLog` before `tearDown`.

even after they are fixed and relaunched.

Solution

I've just added clearBuildLog in two places:

• after TestFailure detection;
• at the very start of tearDown.

[kevmoo]

Is this still a thing?