## Summary
Implemented the last of the request validators from https://dev.azure.com/ma-dev-uk/PrimAITE/_wiki/wikis/PrimAITE.wiki/703/Action-Masking
files and folders validators
## Test process
integration tests for files and folders
added unit tests for previous validators as well
## Checklist
- [X] PR is linked to a **work item**
- [X] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [X] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [ ] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code
Related work items: #2740
a527b8798e