Added a new `ECMJobRunner.Tests` project to the solution for unit
testing, including build configurations for Debug and Release.
Enhanced the `DependencyExtension` class to support dependency
injection for both .NET Framework 4.8 (EF6) and .NET 8 (EF Core)
using conditional compilation. Registered `JobRunnerDbContext`
differently based on the target framework and added AutoMapper
registration for both frameworks.
Updated `ECMJobRunner.Infrastructure.csproj` to include new
package references for DI and AutoMapper in .NET Framework 4.8.
Improved code structure and readability by removing redundant
directives and aligning DI patterns across frameworks.
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