v10.11.7 Notice

[amyblais]

Summary

• In-product notice for v10.11.7 dot release.

Screenshots of the modals or screens in all target clients (required)

• The server upgrade image should display https://github.com/mattermost/notices/blob/master/images/server_upgrade.png along with the text from https://github.com/mattermost/notices/pull/461/files#diff-11766faeb8c25f77d7dbf8e61fd0e9fc8cd1a08858d6b1f8867715a570bfd9d9R120

Test environment (required)

• Server versions - any version from v10.11.0 to v10.11.6; a server version older or newer than v10.11.x

Test steps and expectation (required)

• Spin up a server with a version between v10.11.0 to v10.11.6- the notice should appear only for these versions.
• Spin up a server with a version other than v10.11.x - the notice should not appear for any other versions.

[yasserfaraazkhan]