Add changelog for 2.1.0 [skip ci]

CHANGELOG.md

+## 2.1.0 (2025-04-25)
+
+### Added (2 changes)
+
+- [Support extra artifacts in plan job and pipeline templates](https://gitlab.com/components/opentofu/-/commit/b7b8e55f7df28801d2b68e3b0e6da48dd54a6566)
+- [Add new minor OpenTofu releases](https://gitlab.com/components/opentofu/-/commit/e8e8325c88a0644c3ca2214525088fa9827cae2b) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/274))
+
+### Development (1 change)
+
+- [Skip CI for chore release commits](https://gitlab.com/components/opentofu/-/commit/45f7a582f1b6904677facf8ab9f3eb7ea8bc9c01) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/269))
+
 ## 2.0.0 (2025-04-14)
 
 ### Added (2 changes)