File with invalid characters prevents Windows from checking out master

Summary

https://gitlab.com/BuildStream/buildstream/blob/master/tests/frontend/project/elements/invalid-chars%7C%3C%3E-in-name.bst

contains invalid characters for Windows, making it impossible to checkout the repository.

Steps to reproduce

On windows: git checkout master && git pull

What is the current bug behavior?

The git process dies mid process

What is the expected correct behavior?

I should be on master

Possible fixes

• Create the file on the fly and only on non-windows systems
• Remove the file from the history

Other relevant information

• BuildStream version affected: /milestone %BuildStream_v1.x

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