Fix ignore tests on windows

[eapolinario]

TL;DR

Stacked PR on top of #899 to fix unit tests failures on windows

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

flyteorg/flyte#1437

[codecov]

Codecov Report

Merging #967 (3f112e6) into master (7a7d723) will increase coverage by 0.23%.
The diff coverage is 95.48%.

@@            Coverage Diff             @@
##           master     #967      +/-   ##
==========================================
+ Coverage   85.96%   86.20%   +0.23%     
==========================================
  Files         248      250       +2     
  Lines       23671    23914     +243     
  Branches     2678     2706      +28     
==========================================
+ Hits        20349    20614     +265     
+ Misses       2873     2849      -24     
- Partials      449      451       +2     

Impacted Files	Coverage Δ
flytekit/tools/repo.py	46.03% <0.00%> (+1.25%)	⬆️
flytekit/clis/sdk_in_container/serialize.py	56.52% <33.33%> (+1.85%)	⬆️
flytekit/tools/ignore.py	90.69% <90.69%> (ø)
flytekit/tools/fast_registration.py	84.90% <92.68%> (+41.26%)	⬆️
...ests/flytekit/unit/tools/test_fast_registration.py	100.00% <100.00%> (ø)
tests/flytekit/unit/tools/test_ignore.py	100.00% <100.00%> (ø)

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[kumare3]

security tests seem to have passed.

[kumare3]

@bimtauer we are merging this change, sorry, but to fix we had to create a new PR.