Update ACCESS RP Report template.

[aaronweeden]

Description

This PR updates the ACCESS RP Report template as follows:

• Add CSV download buttons.
• Give unique filenames to each PNG download.
• Move the cell that sets the PROVIDER variable higher up to make it easier to find.
• Remove trailing whitespace from code lines.
• Move common code for making line plots into a function.
• Change x-axis titles from "Time" to "Date."
• Make sure line plots always show the same x-axis ticks even if there are no data available for given ticks (there was a bug in some of the plots in the TAMU report for Q2 2025).
• Combine the plot_cloud_utilization and plot_jobs_utilization functions.
• Hide the long code cell with all the function definitions.

Checklist:

• For each notebook changed:
  • If edits are substantial, the version number at the top and bottom of the notebook has been updated.
  • The compatibility with the XDMoD Data Analytics Framework is correctly documented at the top of the notebook.
  • The copyright year is (years are) correct at the top of the notebook.
  • All cells in the notebook have been run and confirmed they work.
• The appropriate labels have been added to the pull request.
• The milestone is set correctly on the pull request.