Refactor to enforce strictNullChecks

This commit applies `strictNullChecks` to the entire codebase to improve
maintainability and type safety. Key changes include:

- Remove some explicit null-checks where unnecessary.
- Add necessary null-checks.
- Refactor static factory functions for a more functional approach.
- Improve some test names and contexts for better debugging.
- Add unit tests for any additional logic introduced.
- Refactor `createPositionFromRegexFullMatch` to its own function as the
  logic is reused.
- Prefer `find` prefix on functions that may return `undefined` and
  `get` prefix for those that always return a value.

tests/unit/infrastructure/Log/LoggerTestRunner.ts

@@ -2,13 +2,15 @@ import { it } from 'vitest';
 import { FunctionKeys } from '@/TypeHelpers';
 import { ILogger } from '@/infrastructure/Log/ILogger';
 
+type TestParameters = [string, number, { some: string }];
+
 export function itEachLoggingMethod(
   handler: (
     functionName: keyof ILogger,
-    testParameters?: unknown[]
+    testParameters: TestParameters,
   ) => void,
 ) {
-  const testParameters = ['test', 123, { some: 'object' }];
+  const testParameters: TestParameters = ['test', 123, { some: 'object' }];
   const loggerMethods: Array<FunctionKeys<ILogger>> = [
     'info',
   ];