Fix build errors, test failures, and refactor duplicate Reqnroll step bindings

[Copilot]

Addresses build failures, database-related test conflicts, and code duplication in ResourceWatcher test infrastructure per review feedback.

Build Fixes

• Removed non-existent project reference: TesterWorker.csproj was referenced in solution but didn't exist
• Sequential framework execution: Added <TestTfmsInParallel>false</TestTfmsInParallel> to prevent net8.0/net10.0 from running in parallel against shared SQL Server test database, which caused UDT type conflicts in EnsureTableAreCreated()

Code Quality

• Explicit LINQ operations: Replaced implicit filtering with .Where() and foreach mapping with .Select() per analyzer recommendations
• Driver pattern for shared logic: Created CommonStepHelpers static class to eliminate duplication across step definitions:

// Before: Duplicated across SqlStateProviderSteps and StateTransitionsSteps
var modified = LocalDateTimePattern.ExtendedIso.Parse(modifiedString).Value;
var sources = new Dictionary<string, LocalDateTime>(StringComparer.OrdinalIgnoreCase);

// After: Shared helper methods
var modified = CommonStepHelpers.ParseLocalDateTime(modifiedString);
var sources = CommonStepHelpers.CreateModifiedSourcesDictionary();

• Scoped bindings: Added [Scope(Tag = "resourcewatcher")] to StateTransitionsSteps to complement existing [Scope(Tag = "sqlstateprovider")] scoping, preventing step binding ambiguity
• Private methods for reuse: Step classes now use private methods that delegate to shared helpers (e.g., SetModifiedSource())

Test Results

70 tests passing across net8.0 and net10.0 frameworks (44 in ResourceWatcher.Tests, 26 in Sample.Tests)

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