Migrates to Pester5+ tests

[OCram85]

:book: Summary

:bookmark_tabs: Test Plan

:bulb: Select your test plan for the code changes.

• [x] Tested via Drone.io pipeline
• [ ] Custom test
• [ ] No test plan

Details / Justification

:books: Additional Notes

[codecov[bot]]

Codecov Report

Merging #59 (01de79f) into master (c31ee79) will increase coverage by 40.06%. The diff coverage is n/a.

:exclamation: Current head 01de79f differs from pull request most recent head 9a5693d. Consider uploading reports for the commit 9a5693d to get more accurate results

@@             Coverage Diff             @@
##           master      #59       +/-   ##
===========================================
+ Coverage    0.00%   40.06%   +40.06%     
===========================================
  Files          26       26               
  Lines         659      659               
===========================================
+ Hits            0      264      +264     
+ Misses        659      395      -264     

Impacted Files	Coverage Δ
src/Certificate/Get-CSCertificate.ps1	15.38% <0.00%> (+15.38%)	:arrow_up:
src/Private/Get-TempDir.ps1	25.00% <0.00%> (+25.00%)	:arrow_up:
src/Certificate/Use-CSCertificate.ps1	37.93% <0.00%> (+37.93%)	:arrow_up:
src/Private/Get-DefaultCredentialStorePath.ps1	38.46% <0.00%> (+38.46%)	:arrow_up:
src/Private/Import-CSPfxCertificate.ps1	50.00% <0.00%> (+50.00%)	:arrow_up:
src/Certificate/Import-CSCertificate.ps1	50.00% <0.00%> (+50.00%)	:arrow_up:
src/Certificate/New-CSCertificate.ps1	63.26% <0.00%> (+63.26%)	:arrow_up:
src/Certificate/Test-CSCertificate.ps1	65.00% <0.00%> (+65.00%)	:arrow_up:
src/Item/Get-CredentialStoreItem.ps1	67.85% <0.00%> (+67.85%)	:arrow_up:
src/Item/New-CredentialStoreItem.ps1	72.09% <0.00%> (+72.09%)	:arrow_up:
... and 10 more

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