Release v1.28.2

Author: Quinn-With-Two-Ns

releases/v1.28.2

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+# **Highlights**
+
+### Nexus
+🎉 Nexus is now generally available 🎉
+* Main Nexus APIs are no longer marked as experimental.
+* Attaching multiple Nexus callers to an underlying handler Workflow is now Pre-release.
+
+# What's Changed
+
+2025-03-20 - 00991345 - Fix workflow ID reuse policy and conflict policy handling (#2446)
+2025-03-20 - 0ee60c04 - Unblock UseExisting conflict policy for Nexux WorkflowRunOperation (#2440)
+2025-03-20 - 1941d38e - Remove experimental tag from Nexus (#2454)
+2025-03-20 - 1f3f0687 - Fix spring boot api key enable https (#2445)
+2025-03-20 - 26de2514 - Make sure the Schedule Client has the namespace header injected (#2452)
+2025-03-20 - e3fbdfbe - Add OnConflictOptions Support (#2415)