Merge changelog entries for v3.7.1 release (#769)

Co-authored-by: github-actions[bot] <tfmod442916@users.noreply.github.com>

Author: mawasile

.changes/3.7.1.md

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+## 3.7.1 - 2025-05-13
+
+### 🪲 Fixed
+
+* [#702](https://github.com/microsoft/terraform-provider-power-platform/issues/702) Fix retryAfter function to properly handle all formats of Retry-After HTTP header as defined in RFC 7231
+* [#705](https://github.com/microsoft/terraform-provider-power-platform/issues/705) Replace panic with error handling in environment_settings models.go
+* [#707](https://github.com/microsoft/terraform-provider-power-platform/issues/707) Added nil check for HTTP response in doRequest method to prevent potential nil pointer dereference
+* [#708](https://github.com/microsoft/terraform-provider-power-platform/issues/708) Improve DeleteEnvironment function behavior: Handle 404 responses gracefully and adjust state management in Delete method
+* [#710](https://github.com/microsoft/terraform-provider-power-platform/issues/710) Fixed improper error handling by replacing err.Error() calls with properly wrapped errors using fmt.Errorf() with %w verb or directly passing the error object. This preserves error context and enables better debugging.
+* [#687](https://github.com/microsoft/terraform-provider-power-platform/issues/687) Fixed an issue where required field validation could fail incorrectly if the referenced field was missing or not unique in the configuration.
+* [#749](https://github.com/microsoft/terraform-provider-power-platform/issues/749) Nil pointer dereference in regex validation.
+* [#704](https://github.com/microsoft/terraform-provider-power-platform/issues/704) Replaced panic with proper error handling in ExecuteApiRequest function
+* [#756](https://github.com/microsoft/terraform-provider-power-platform/issues/756) fix: refine current value check in MakeFieldRequiredWhenOtherFieldDoesNotHaveValueValidator
+* [#767](https://github.com/microsoft/terraform-provider-power-platform/issues/767) feat: implement conflict handling and retry logic for environment operations
+
+### 📚 Documentation
+
+* [#768](https://github.com/microsoft/terraform-provider-power-platform/issues/768) documentation for governance