Add Pathway Summary table to Pathways Dashboard

User Story

As a pathway administrator or course team member, I want the most important high-level information about my currently filtered pathways to be shown at the top of the pathway dashboard, so that I can access that information quickly before scrolling further down to dive into more details.

Acceptance Criteria

Description: A Pathway Summary table has been added to the Overview section of the Pathway Dashboard.
Given I am a user with access to the Pathway Dashboard
When I view the Overview section
Then I see a Pathway Summary table showing the following for each currently filtered Pathway(s):

• Pathway
• Organization
• N of learners currently enrolled
• N of learners that have passed all pathway courses to date
• Pass rate (%) — (N of learners who have passed the pathway* / N of learners enrolled in pathway) x 100
• Average time from start to pass all courses in the pathway, of those who passed (in weeks)
• N of pathway items
• Item with highest pass rate
• Item with lowest pass rate
• N of pathway certificates earned

And I am able to sort this table by any column
And this column is sorted by the Pathway column (from A-Z) by default

*Note: For the Willow release, passing the pathway will mean passing every course in the pathway.

Start at the Pathway Dashboard's Overview section and trace how currently filtered pathways and learner metrics are loaded. Implement the Pathway Summary table with the listed columns, calculations, sorting for every column, and Pathway A-Z as the default order. Done means the table appears for filtered pathways and matches all stated acceptance criteria.