Update registry1.dso.mil/ironbank/opensource/mattermost/mattermost Docker tag to v9.9.0

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/mattermost/mattermost (source)	minor	9.8.1 -> 9.9.0

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Upgrade Notices

These items were removed in the upstream mattermost release, be advised if you are using any of these features

• Removed support for self-serve purchases of Mattermost Subscriptions in various flows, throughout Cloud and Self Hosted environments.
• Removed support for self-serve true up review submission in the System Console.
• Removed the PostPriority feature flag.
• Removed SelfHostedPurchase setting from config.json

added Package Sustainment kindmaintenance mattermost labels

mentioned in issue #136 (closed)

added teamStorage & Collaboration label

assigned to @akesterson

Notable changelog items

• Removed safety limit error message in compiled Team Edition and unlicensed Enterprise Edition deployments when message count exceeds 5 million posts.
• Removed support for self-serve purchases of Mattermost Subscriptions in various flows, throughout Cloud and Self Hosted environments.
• Removed support for self-serve true up review submission in the System Console.
• Removed the PostPriority feature flag.
• Added the initial version of new client-side performance metrics to track web app performance and can be monitored in new Grafana board.
• Removed SelfHostedPurchase setting from config.json
• v9.9 is built with Go v1.21.8.
• Removed @stripe/react-stripe-js and @stripe/stripe-js, and added web-vitals at https://github.com/mattermost/mattermost.
• Push notifications don’t always clear on iOS when running Mattermost in High Availability mode.

added 4 commits

• 2e989c65...c83c5286 - 2 commits from branch main
• b586ea19 - Update registry1.dso.mil/ironbank/opensource/mattermost/mattermost Docker tag to v9.9.0
• e6adb169 - #136 (closed) : Take in postgresql newline change with Mattermost 9.9.0

Compare with previous version

added 1 commit

• a3709f2b - #136 (closed) : Take in postgresql newline change with Mattermost 9.9.0

Compare with previous version

marked this merge request as ready

changed the description

added statusreview label

requested review from @dchen, @michaelmartin, @chris.oconnell, @kershaw.jacob, @samvongsay, and @benjamin.starks

approved this merge request

merged

mentioned in commit 740697ae

mentioned in merge request big-bang/bigbang!4534 (merged)