Make prefix not being recognised as dirs anymore

[frndmg]

Fixes #208

[pjbull]

Thanks @frndmg! We have to get this onto a branch rather than a fork to do the live tests, but lets make the updates here for the tests first.

[frndmg]

@pjbull, thanks for your review!

Now testing for mocked backend and using already uploaded files.

Let me know if there is anything else that needs to be adjusted 👍

Feel free to push this to a local branch 👍

[pjbull]

Thanks @frndmg! Once CI passes here, I'll pull over to a local branch to run the tests against live servers

[pjbull]

Actually, would you mind adding a note in the HISTORY.md as well? I believe you need to start a new "unreleased" section. Here's an old one for reference:

cloudpathlib/HISTORY.md

Lines 3 to 5 in 85268c8

	## v0.7.2 (UNRELEASED)
	- Fixed pickling of `CloudPath` objects not working. ([Issue #223](https://github.com/drivendataorg/cloudpathlib/issues/223), [PR #224](https://github.com/drivendataorg/cloudpathlib/pull/224))

[frndmg]

@pjbull feel free to update the message in the HISTORY.md if you want

[codecov-commenter]

Codecov Report

Merging #244 (c76c96a) into 244-cloud-tests (2e52c05) will decrease coverage by 0.5%.
The diff coverage is 100.0%.

@@                Coverage Diff                @@
##           244-cloud-tests    #244     +/-   ##
=================================================
- Coverage             95.0%   94.4%   -0.6%     
=================================================
  Files                   21      21             
  Lines                 1323    1324      +1     
=================================================
- Hits                  1257    1251      -6     
- Misses                  66      73      +7     

Impacted Files	Coverage Δ
cloudpathlib/s3/s3client.py	92.9% <100.0%> (-2.6%)	⬇️
cloudpathlib/gs/gsclient.py	92.8% <0.0%> (-1.8%)	⬇️
cloudpathlib/cloudpath.py	93.5% <0.0%> (-0.5%)	⬇️