Update filesystem utilities tests to work on both Unix and Windows

[rpeden]

Some of the tests for prefect.utilities.filesystem:filter_files currently fail on Windows. The tests check for hardcoded Unix-style paths with forward slashes, but filter_files returns a set of paths with backslashes on Windows.

The current behavior of filter_files appears correct based on how it is used in the codebase, so this PR updates the tests to tailor the expected output of filter_files to match the platform the tests are running on.

Example

Before:

> pytest test_filesystem.py

test_filesystem.py ..FFF.FFFFF.ssss....                                                                         [100%]

===================== 8 failed, 8 passed, 4 skipped in 28.76s =====================

After:

> pytest test_filesystem.py

test_filesystem.py ............ssss....                                                                          [100%]

===================== 16 passed, 4 skipped in 28.41s =====================

Everything passes on Linux and MacOS before and after the changes in this PR.

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • I don't think this is big enough to need an issue but I can open one if needed.
• This pull request includes tests or only affects documentation.
• This pull request includes a label categorizing the change e.g. fix, feature, enhancement, docs.

For documentation changes:

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