[FEATURE] Only upload a coverage report.

[plannigan]

User Story/Description

I have a different plugin that allows to running unit tests for a project in multiple environments (generated Buildkite steps). My plugin uses this plugin to upload coverage reports from those different environments. However, that means that projects which use my plugin are restricted to the capabilities of this plugin that mine exposes.

Describe the solution you propose (if applicable)

An option to skip the source code scanning all together and only upload a coverage report from a test execution.

Describe alternatives you've considered

Depending on the internals of this plugin, it might be simpler to create a different plugin that just uploads coverage reports.

Additional context

I don't know how SonarQube internally tracks test coverage. While I hope it is not the case, I could see it being tied to a code scan. If that is the case, that might make this request difficult or impossible.