Make CompareText.tests.ps1 work

[per-oestergaard]

PR Summary

I am not sure why the tests does not work. It seems to be related to when $TestCases is set and perhaps it is related to Pester v5. Anyway, the tests now work by 'elevating' the $TestCases variables so they are available during the discovery phase.

I also added Import-Module, but that is just because I am not sure how that should fit in. If that is the wrong place, please just delete the line again.

I also snug into .gitignore that is should ignore my .devcontainer. I am working on Ubuntu 22.04 with vscode and thus wanted to isolate the environment in a container.

I did change the casing of test/TextTableParser.Tests.ps1 to lowercase 'tests' to align with the other files. However, I switched back so the diff can show the changes I made.

PR Context

I was planning to create a PR on another issue but before doing so, I wanted to ensure I could run the tests successfully.

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