Add changelog for 0.42.0-rc3

CHANGELOG.md

+## 0.42.0-rc3 (2024-11-14)
+
+### Added (2 changes)
+
+- [Support running pipeline templates directly in child pipeline with...](https://gitlab.com/components/opentofu/-/commit/cc000b48848916dcee2564e22bc2dfdff8f49729) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/190))
+- [Support env variable to force sourcing `gitlab-tofu`](https://gitlab.com/components/opentofu/-/commit/05a987a8a3d94a7286819fbe2e8f908029fe8f9a) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/184))
+
+### Changed (1 change)
+
+- [Rename `TF_GITLAB_SOURCED` variable to `GITLAB_TOFU_SOURCED`.](https://gitlab.com/components/opentofu/-/commit/d003be31b40f63b0779839de292f4a5e6cc20dff) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/188))
+
+### Removed (2 changes)
+
+- [Remove `TF_FF_AUTO_URLENCODE_STATE_NAME` feature flag](https://gitlab.com/components/opentofu/-/commit/300f345e0b3952ac37305b130231832494dd0d1b) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/187))
+- [Remove `TF_FF_AUTO_APPROVE_APPLY` feature flag](https://gitlab.com/components/opentofu/-/commit/bac5a61b3915aa91f3fddf577cf3dd266786f41a) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/186))
+
+### Development (2 changes)
+
+- [Rename internal `OPENTOFU_COMPONENT_` variables to `GITLAB_TOFU_`](https://gitlab.com/components/opentofu/-/commit/70a67d253df6ceed8fd19f067c98bf5da34abbce) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/185))
+- [Support custom runner tag for image build job](https://gitlab.com/components/opentofu/-/commit/cfbc9d7950c7651f2cc0a551dfe52d623e19afb0) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/183))
+
 ## 0.42.0-rc2 (2024-11-13)
 
 ### Added (1 change)