solve roredered_reaches issue when two independent diffusive mainstem domains are applied

[kumdonoaa]

When a single diffusive domain is applied for the hybrid routing in t-route, python dictionary refactored_reaches takes its values as a list of lists of reaches of diffusive mainstem domain. However, when multiple diffusive domains are applied, the dictionary values were somehow melted down to a list of a single list of all diffusive mainstem segments except downstream end segments of tributaries entering the mainstem. This should be still the same format as a list of lists. This is solved now.

Additions

• Python dictionary refactored_reaches_batch takes a list of lists for each diffusive mainstem defined by a given TW and then keep the form in Python dictionary refactored_reaches.

Removals

Changes

Testing

Screenshots

Notes

Todos

Checklist

• PR has an informative and human-readable title
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• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future todos are captured in comments
• Visually tested in supported browsers and devices (see checklist below 👇)
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Testing checklist

Target Environment support

• Windows
• Linux
• Browser

Accessibility

• Keyboard friendly
• Screen reader friendly

Other

• Is useable without CSS
• Is useable without JS
• Flexible from small to large screens
• No linting errors or warnings
• JavaScript tests are passing

[BrianAvant]

Can you add changes to src/troute-network/troute/nhd_network_utilities_v02.py from this PR? Then we can merge all at once