breaking change of list_parsers and others by introducing as_list option

introducing default "as_list: bool = True," for below methods introduces a breaking and inconsistent change, as others default to False.

[https://github.com/search?q=repo%3Agoogle%2Fsecops-wrapper+%22as_list%3A+bool+%3D+True%22&type=code](https://github.com/search?q=repo%3Agoogle%2Fsecops-wrapper+%22as_list%3A+bool+%3D+True%22&type=code)

pls change default to old way of returning "raw api response with pageination info", or default to True everywhere.

Search the repository for methods declaring "as_list: bool = True" using the linked code-search query, then compare their defaults and return behavior with the other parser methods. Decide whether the defaults should preserve the raw API response with pagination information or be consistent across methods, and verify all affected methods follow the chosen behavior.

Written by the indexing model from the issue text.