Auto merge of #12556 - szeged:htmltests, r=jdm

Refactoring the WebBluetooth html tests.

<!-- Please describe your changes on the following line: -->
We refactored the existing html tests, created new ones for every function of WebBluetooth specification and we moved them into a new folder. In every new test there are different test cases for each step of the function.
On this page (http://szeged.github.io/servo/testing/) there is a description about these tests, which describes the steps, the test cases, the expected behavior and the actual result.

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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [x] These changes do not require tests because these are tests for WebBluetooth.

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