Add changelog for 2.0.0-rc1

CHANGELOG.md

+## 2.0.0-rc1 (2025-04-10)
+
+### Changed (2 changes)
+
+- [Change default for `version` input to match component version](https://gitlab.com/components/opentofu/-/commit/9b69280a41644f127e47c812b64dd1426ff78eb9) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/266))
+- [Use GITLAB_TOFU_STATE_NAME for plan job resource_group value](https://gitlab.com/components/opentofu/-/commit/00f5ccbad78bd04aaa2d2a00e4fb668d7b5b435f) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/265))
+
 ## 1.1.0 (2025-03-21)
 
 ### Added (1 change)