Update run_transit_assignment.bat to support c26q2

[tinleycraig]

Revise code in run_transit_assignment.bat to accommodate changes made to batch_file.yaml for c26q2.

[tk-oleary]

Need to update commands in transit demand and assignment batch files to reference uv instead of the old environment manager

(e.g., remove references to "Scripts/manage/env.cmd," and rewrite "python " to "uv run "