Add Submissions tab to User profiles

Problem/Motivation

Users should be able to see all of their webform submissions in one place. This feature helps with GDPR compliance because users can now see all their submissions in one place.

Proposed resolution

Add 'Submissions' tab to User profiles.

Remaining tasks

• Add 'Access own webform submission overview page' (access own webform submission overview) permission.
• Add webform.user.submissions (user/{uid}/submissions) route
• Check link access on User submission page.
• Write tests
• Create change record

Notes

• Goal is to implement an MVP solution that can be improved as needed
• Could allow admins to customize the visible columns
• Add keyword and source entity filter

User interface changes

• 'Submissions' tab added to user profiles.

API changes

Refactoring of \Drupal\webform\WebformSubmissionListBuilder

Data model changes

N/A