Issue Summary

Currently the calculation for the average sprints days in the "Release Plan Progress chart":
1. includes weekends
2. is calculated by end date subtract start date

However, this is inaccurate.
1. This calculation should not include weekends if the sprints are set to x week days rather than y weeks.
2. The calculation should be an "inclusive at both ends" calculation.

For example
If Start date is Monday 1st March and End Date is Sunday 14th March
a. "Exclusive at one end" result

b. "Inclusive at both ends" result

Then remove weekends: 4 days.
a. 9 days (Incorrect)
b. 10 days (Correct)

Steps to Reproduce

Conditions:
Portfolio A
Program A
Program Increment 1
Team A and Team B
Sprints A, B, C, D, E each of 10 week days

Generate Team Sprints

1. Release Plan Progress chart: https://xyz.jiraalign.com/ReleaseBurndown
2. Set Portfolio A in top-nav bar
3. Set Program Increment 1 in top-nav bar
4. Click on Burn Details

Expected Results

Average Sprint days would be 10 days.

Actual Results

Average sprint days is 13 days.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available