Adjust `internal/scripts/generate-coverage.sh` to use source-coverage

## Brief feature description

The current code coverage script is not yet perfectly configured to generate a branch coverage report.
Follow the documentation from:
* https://doc.rust-lang.org/rustc/instrument-coverage.html
* https://rustc-dev-guide.rust-lang.org/llvm-coverage-instrumentation.html

To adjust the script so that it generates a coverage report
* for the whole iceoryx2 workspace
* for every component individually, via CLI arguments
* for the C and C++ language bindings.

Start with internal/scripts/generate-coverage.sh and the Rust coverage documentation linked in the issue. Check how the script currently selects targets, then verify that it can produce workspace-wide coverage, component-specific reports through CLI arguments, and reports for the C and C++ bindings; the script’s generated reports are the completion criteria.

Written by the indexing model from the issue text.