fix build warnings

[ErikEJ]

fixes #47

[Copilot]

Pull Request Overview

This pull request addresses build warnings in the codebase by improving nullable reference type annotations and code analysis compliance. The changes focus on making the code more robust by properly handling null values and suppressing specific code analysis rules where appropriate.

• Add nullable reference type annotations to fix compiler warnings
• Initialize properties with non-null values or null-forgiving operators
• Add code analysis suppressions for acceptable design patterns
• Handle potential null returns with fallback values

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Vsix/Dialogs/PickTablesDialog.xaml.cs	Added blank line for formatting
src/DacFXToolLib/TableListBuilder.cs	Made databaseModel field nullable
src/DacFXToolLib/Routines/SqlServerRoutineModelFactory.cs	Added null-forgiving operators and null coalescing for string properties
src/DacFXToolLib/Routines/Extensions/SqlServerRoutineServiceCollectionExtensions.cs	Made reporter parameters nullable
src/DacFXToolLib/HumanizerPluralizer.cs	Removed null-conditional operators
src/DacFXToolLib/GlobalSuppressions.cs	Added code analysis suppression for generic list exposure
src/DacFXToolLib/DatabaseModelToMermaid.cs	Added null-forgiving operator for foreignKey.Name
src/DacFXTool/Program.cs	Made schemas array nullable and used null-coalescing with empty array
src/Contracts/GlobalSuppressions.cs	Added code analysis suppression for generic list exposure
src/Contracts/DatabaseType.cs	Added pragma directives to suppress FlagsAttribute warning

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