Enable Github summary report

[tkilias]

Findings in report.yml, columns:

• DEVDOC: whether the resp. finding affects the repository developer-documentation,
• PTB: whether the finding affects the folder .github/workflows/ in the PTB
• PTB Template: whether the finding affects the folder exasol/toolbox/templates/github/workflows/ in the PTB

Location	Finding	DEVDOC	PTB	PTB Template
Step "Generate GitHub Summary", poetry run -- coverage report --format markdown	must ignore coverage error due to no data	Y	Y	Y
Step "Copy Artifacts into Root Folder"	copies 2x .lint.txt but must copy .lint.json, too	Y	-	Y
Step "Generate GitHub Summary"	contains 2x security, but must be 1x lint and 1x security	Y	-	-