Don't pass project and token to BaseTestResult

What does this MR do and why?

Re: gitlab-org/gitlab#468942 (closed)

The MR essentially reverts most of the initializer changes in !213 (merged), and added a hard coded project and empty token to fetch file line content. If the request to file_contents raises an error when called inside the repository_file_line_content function, we will ignore the exception and return nil, indicating that the file line content is not available.

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