connects #178

This pull request updates the terminology and presentation throughout the PowerpointReportGeneratorService to replace "NEBs" (Non-Energy Benefits) with more user-friendly terms like "Operational Impacts," "Operational Cost Savings," and "Multiple Benefits." The changes improve clarity and consistency in the generated PowerPoint reports, ensuring that table headers, chart titles, and slide content reflect the updated language.

Terminology and Label Updates:

• Replaced "NEBs" and "Non-Energy Benefits" with "Operational Impacts," "Operational Cost Savings," or "Multiple Benefits" in table headers, chart labels, and slide titles throughout the service. This includes updates to summary tables, payback tables, and bar chart data/labels.
  Slide Content and Asset Updates:

• Updated slide titles and descriptive text to use "Operational Improvements" and "Multiple Benefits" instead of "NEBs." Also updated associated images to reflect the new terminology.

Consistency Improvements:

• Ensured all chart titles, table headers, and labels consistently use the new terminology for operational and multiple benefits, reducing user confusion and aligning with current best practices.

These changes modernize the language in our reporting and make the outputs more accessible and understandable for end users.