Fix type hints in task generator functions

[tomuben]

Background

Due to a limitation in the itde, see ttps://github.com/exasol/integration-test-docker-environment/issues/445, the BaseTask was defined as yielded type. Now, that the issue is fixed in the itde we can set the correct generator type in all todos.

As example see

script-languages-container-tool/exasol/slc/internal/tasks/test/run_db_test_folder.py

Line 49 in 3171705

# Correct return type is Generator[RunDBTestsInDirectory, Any, RunDBTestDirectoryResult]