docs: Add release notes for 2.16.0 (#6431)

Co-authored-by: robot-ci-heartex <robot-ci-heartex@users.noreply.github.com>
Co-authored-by: caitlinwheeless <caitlin@humansignal.com>

docs/source/guide/release_notes/onprem/2.16.0.md

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+## Label Studio Enterprise 2.16.0
+
+<div class="onprem-highlight">Video frame classification, user activation through SCIM, and bug fixes </div>
+
+*Sep 24, 2024*
+
+Helm Chart version: 1.6.3
+
+
+### New features
+
+#### Video frame classification
+
+You can now apply labels to video frames. Previously, we only supported per-video classification. This new feature allows you to apply labels at a per-frame level. 
+
+You can implement this feature using a new tag: [`<TimelineLabels>`](/tags/timelinelabels). 
+
+For more information, see [New! Video Frame Classification](https://humansignal.com/blog/video-frame-classification/).
+
+![Video frame classification](/images/releases/2_16_video.png)
+
+
+### Enhancements
+
+- You can now deactivate and activate user accounts via SCIM. Note that for this to work, `manual_role_management` must be set to `False`.  
+
+- Changed the default behavior of the project Dashboard so that it no longer defaults to the “include time” option in the calendar.
+
+### Bug fixes
+
+- Fixed an issue where user limits were not being enforced when users were added via LDAP.
+
+- Fixed a regression issue with BigInteger support in the Data Manager.
+
+- Fixed a styling issue in which buttons were overlapping in the review workflow.
+
+- Fixed an issue with the Activity Logs page where some options would become unavailable.
+
+- Fixed an issue where setting a task agreement threshold incorrectly affected counts in the project Dashboard.
+
+- Fixed an issue in which notifications were fetched too frequently.
+
+- Fixed an issue with a missing `db` field for Redis storage, which caused issues for users adding Redis target storage.
+
+- Fixed an issue in which project-level roles could not be reverted once set.
+