Feature/non standard csv filename

[danhamill]

Add Support for Non-Standard CSV Filename Patterns

This PR enhances the CSV ensemble reader to handle files with non-standard naming conventions, improving flexibility for different watershed data sources.

🚀 Key Features

• Configurable filename patterns: Added suffix parameter to CsvEnsembleReader constructor to support different CSV file naming conventions
• Enhanced test coverage: Restructured test resources and expanded testing for multiple watershed filename patterns
• Backward compatibility: Existing functionality remains unchanged while adding new flexibility

📁 Changes Made

Core Implementation:

• Modified CsvEnsembleReader.java to accept suffix parameter for flexible filename patterns

Test Infrastructure Updates:

• Restructured test resources into watershed-specific directories (FeatherYuba/, Kanektok/)
• Updated TestingPaths.java to dynamically build paths for reorganized structure
• Enhanced Testing.java bulk testing to validate multiple watershed patterns
• Updated various test classes to work with new directory structure

Test Data:

• Added FeatherYuba hindcast CSV files with different naming structure for comprehensive testing
• Organized existing Kanektok test files into subdirectory

✅ Testing

• All existing tests pass with backward compatibility maintained
• New test cases validate different CSV filename patterns
• Bulk testing covers multiple watershed scenarios

[ktarbet]

Looks good! I've added a couple suggestions.

[ktarbet]

consider updating java doc.

Suggested change

	* @param path path to csv file cache (example C:\Temp\hefs_cache)
	* @param path path to csv file cache (example C:\Temp\hefs_cache)
	*
	* @param suffix for csv file (not including .csv)

[ktarbet]

Please add an overloaded constructor for users that are using this the old way.

public CsvEnsembleReader(String path) {
this.suffix="";
this.pathToCSV = path;
}