As a user, I can use a "Test Execution Duration Trend" gadget

A new JIRA gadget "Test Execution Duration Trend" should provide a trend chart for showing the overall elapsed execution time (the sum of the elapsed time of the test runs in a final status) for multiple Test Execution (e.g. from a Test Plan, a version).

Aim: This chart will provide the means to analyze several key factors:

• (automated) testing performance (where are the "pains" impacting CI and feedback to users)
• how code (tests+SUT) is evolving between different code revisions

xx: date
yy: duration

Group: person, component, label, priority or none

Filters:

• saved filter (for finding Test Executions)
• testplan or project+version
• test run's assignee, status, priority, component
• test environment
• test type

Chart Title: by default "Test Execution Duration Trend" but may be customized