[CI Environment] Align `Join-Path` usage + minor formatting updates

[AlexanderSehr]

Description

• Aligned the usage of Join-Path usage to one consistent approach
• Updated some path actions
• Updated formatting of several small element

Pipeline references

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Type of Change

Please delete options that are not relevant.

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Update to documentation