LocalFileModelRepository - Add support for "safe names" for predictable file paths

**Is your feature request related to a problem? Please describe.**
Currently we are using things like Experiment Name and Deployment Name as part of file paths in the LocalFileModelRepository, if either of these names contain invalid characters for a file system path then we will be unable to save the files.

**Describe the solution you'd like**

- Experiments would have a "safe name" that can be used in URLs and file paths, it would only support alphanumeric, hyphens, underscores and dot characters.
- Deployments would have a "safe name" that can be used in URLs and file paths, it would only support alphanumeric, hyphens, underscores and dot characters.
- All folder paths and/or URLs would use these safe names.

**Describe alternatives you've considered**

- We discussed cleaning the names to remove any invalid character from the path, this however would result in unpredictable file paths
- We discussed using just the IDs to form the paths but then this would make all paths unreadable
- We discussed restricting the characters that can be used for naming but this may be undesired to change UI behaviour and display based on file system requirements