Add workflow for unit test code coverage results

[daniel-milchev]

An action like the one in container-management could be added to all repositories to show the code coverage of the unit tests.

Tasks:

• Add workflow for unit test code coverage results update-manager#50
• Add workflow for unit test code coverage results local-digital-twins#36
• Add workflow for unit test code coverage results software-update#66
• Add workflow for unit test code coverage results azure-connector#52
• Add workflow for unit test code coverage results system-metrics#33
• Add workflow for unit test code coverage results file-backup#51
• Add workflow for unit test code coverage results file-upload#92
• Add workflow for unit test code coverage results suite-bootstrapping#38
• Real coverage percentage is not shown in README.md software-update#68
• Real coverage percentage is not shown in README.md file-backup#53
• Real coverage percentage is not shown in README.md file-upload#94

Align coverage badge and logo:

• Align coverage badge and logo functionality aws-connector#11
• Align coverage badge and logo functionality container-management#226
• Align coverage badge and logo functionality suite-connector#98