* Add unit and integration tests for `DownloadHttpFile` activity
- Developed comprehensive unit tests for the `DownloadHttpFile` activity validating method execution (GET, POST), URL handling, headers, and status codes.
- Added integration tests to verify functionality like authorization headers, filename extraction, and response stream handling.
- Updated `IntegrationTests` project references to include the required `Elsa.Http` module.
* Refactor `DownloadHttpFileTests` to simplify test setup and improve reusability
- Consolidated test initialization logic into `RunActivityAsync` for cleaner and reusable test setup.
- Updated existing tests to use `RunActivityAsync`, reducing boilerplate code.
- Unified filename extraction tests into a parameterized theory to improve test coverage and clarity.
- Simplified helper handlers with expression-bodied members for readability.
* Add comments to clarify HttpResponseMessage disposal responsibility in `DownloadHttpFileTests`.
* Ensure `HttpResponseMessage.Content` is always set to prevent null reference issues in `DownloadHttpFileTests`.
* Refactor `DownloadHttpFileTests` to ensure `HttpResponseMessage.Content` is always initialized and simplify content assignment logic.
* Update `DownloadHttpFileTests` to set an empty `HttpResponseMessage.Content` for testing `HasContent` behavior
* Add `GitHubActionsTestLogger` package to test projects and refactor `Directory.Packages.props`
- Updated unit and integration test projects to include `GitHubActionsTestLogger` for improved test reporting in CI.
- Refactored `Directory.Packages.props` to add conditional dependencies for .NET 8, 9, and 10 compatibility.
* Remove `GitHubActionsTestLogger` package from test projects.
* Add project reference for unit tests and update `DownloadHttpFileTests`
- Included `Elsa.Activities.UnitTests` project reference in `IntegrationTests` to reuse helpers.
- Removed redundant `TestHttpMessageHandler` by utilizing shared helper from `UnitTests`.
* Refactor `DownloadHttpFileTests` to remove unused methods and simplify imports
* Update target framework to .NET 10 and upgrade `Nuke.Components` package to v10.0.0
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