Refactor source loading #4963
Description
After the change introduced in #4811, the source is potentially loaded twice during the execution of a test. First, for analyzing the dependencies in the test and deciding if Binary Provisioning is required, and then (if the binary provisioning is not required), for the test execution.
The input loading could be refactored in a way that is available for both the binary provisioning and the text execution. For example, making it available in the global context. This would require refactoring how the test execution loads the input.