Add a preTaskExecution Hook

[Gijsdeman]

Currently, Nx provides a preTasksExecution hook that runs once before all tasks in a run-many command are executed. While this is useful for global setup, it is too coarse-grained for some workflows. In a run-many context, each task is conceptually independent, yet there is no lifecycle event that runs before each one individually. As a result, it is impossible to perform per-task setup, instrumentation, or environment preparation in a structured way.

Suggested Change
Introduce a preTaskExecution hook that runs before each individual task begins. This would complement preTasksExecution and postTasksExecution by enabling finer-grained control and consistency in the task lifecycle. The new hook should receive a context object that includes the Task being executed, allowing it to access task-specific information.