All tests built with net10.0, project-under-test is referenced with specific framework version

[Seramis]

Description

All test projects are now just net10.0 projects. Command line parameter is used to run the same tests with different implementation framework binaries.
Badges updated in docs - all are brightgreen as all framework builds are now tested against.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Other (please specify): Tests

Checklist

• The PR is submitted to the correct branch (main).
• My code follows the project's coding style. (.editorconfig)
• I have commented my code, particularly in hard-to-understand areas and public interfaces.
• I have added or updated tests for the changes I made.
• All new and existing tests passed.
• I have updated the documentation where applicable.