[RUN-4297] fix race condition, now each instance uses its own tmp directory

[ronaveva]

This pull request improves the handling and documentation of temporary working directories in the AnsibleRunnerContextBuilder class. The changes clarify that each builder instance now uses its own exclusive temporary directory, improving safety and isolation during parallel executions. The code and comments have been updated to reflect this change, and the directory creation logic has been made more robust.

Directory isolation and safety improvements:

• Updated the implementation so each builder instance creates and uses its own exclusive temporary directory (named ansible-exec-<executionId>-builder-<rand>/), ensuring no files are shared between sibling builders and making recursive cleanup always safe. [1] [2] [3]

Documentation and logging enhancements:

• Improved comments and logging throughout the class to clarify the exclusive ownership of the builder-specific directory, its naming convention, and the implications for cleanup and debugging. [1] [2] [3]