Milestone report fixes

[bwhite001]

Milestone Report Update

This pull request includes an update to the Milestone Report feature, with the following changes:

Changes in MilestoneReport.tsx

• Added new columns for milestone and overall_percent in columns array.
• Updated the columns array in PDF export with new field names.
• Updated the columns in ColumnsDirective with new field names.

Changes in MilestonePlanningItem.ts

• Added a new class called MilestoneRequirements to represent milestone requirements for each event.
• Added a new class called MilestoneCurrent to represent the current milestone status for each event.
• Created a new function called calculateMilestone to calculate and return the milestone progress in an object.
• Updated the MilestonePlanningItem class to:
  • Initialize overall_percent with an empty string.
  • Utilize the MilestoneRequirements and MilestoneCurrent classes to calculate milestone progress.