DYN-7409: Properly use the userData CLI parameter

[twastvedt]

Fixes the following bug:
The userData CLI argument seems to intend to set the user data directory, but the value passed is only used for loading packages, not for loading the preferences file. Preferences are still loaded from the default "Dynamo Core" folder.

When running the CLI, the Preferences singleton first gets initialized here, using the PathResolver created the line above, which is constructed without the userData folder from the cli args. Only a few lines later, when calling StartDynamoWithDefaultConfig, is the userData cli arg used, but by then Preferences has already been initialized.

This PR modifies the initial PathResolver above to make use of the userData parameter. If the preferences file does not exist at the userData folder it falls back to using the default user data folder for preferences (preserving current behavior).

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Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

Fix a bug with setting preferences file location via userdata parameter in CLI.

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[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-7409

[github-actions]

UI Smoke Tests

Test: success. 11 passed, 0 failed.
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Check: UI Smoke Tests

[mjkkirschner]

will this traverse the newly set user data folder from the command line args and check for a prefs file there?

[twastvedt]

Yes. If userData parameter is, e.g. %appData%\Dynamo\Dynamo Revit, PathManager.Instance.PreferenceFilePath is %appData%\Dynamo\Dynamo Revit\3.4\DynamoSettings.xml.

[mjkkirschner]

can you say a bit more about this:
but not the preferences file location because of complexities in the initialization order.?

[twastvedt]

can you say a bit more about this: but not the preferences file location because of complexities in the initialization order.?

Added some detail in the description, let me know if it's still unclear.

I'm struggling a bit to figure out how to test this. I can make a test which starts a separate CLI process with the userData argument, but I'm not sure how to find out what preference file was loaded in that process. I haven't found a preference setting I could set that would alter the result of a graph, without getting into a custom package. Any thoughts on a way to do this simply?