v0.20.1-ig59

ImageGenius Changes:

rebase to alpine edge.

kopia Changes:

Command-Line Interface

• minor cleanups in diff tests (#4594) by Julio Lopez

Server

• fixed server-based notifications (#4598) by Jarek Kowalski

Snapshots

• fixed snapshotting of \server\share (#4603) by Jarek Kowalski
• Remove checkpoints after a complete snapshot (#4439) by shniubobo

Notifications

• fixed notification severities on snapshot creation (#4604) by Jarek Kowalski

CI/CD

• enforce consistent formatting of KopiaUI code (#4586) by Jarek Kowalski

Graphical User Interface

• reformat code to 120 characters per line (#338) by Jarek Kowalski
• fixed 'Set Policy' button (#337) by Jarek Kowalski
• SMTP credentials should not be required (#336) by Jarek Kowalski
• ignore exceptions when making incremental changes to the policy (#335) by Jarek Kowalski
• report code coverage (#334) by Jarek Kowalski
• globally apply prettier formatting (#333) by Jarek Kowalski