No error emitted when using a YAML configuration without additional dependency

## Description

The software ignores YAML configuration silently if YAML configuration is used with the dependencies specified on the [Maven, Ivy Gradle Artifacts page](https://logging.apache.org/log4j/2.x/maven-artifacts.html#Using_Log4j_in_your_Apache_Maven_build) (log4j-api and log4j-core) but not with the Jackson Databind and YAML Data Format dependencies.

## Configuration

**Version:** 2.20.0

**Operating system:** Windows 11 (build 22621.1702)

**JDK:** openjdk 19.0.2 2023-01-17

## Logs

None, no warning about using default configurations or being unable to process a log4j2.yaml file found on the classpath.

## Reproduction

1. Create a YAML configuration file named log4j2.yaml on the classpath turning on debug messages.
2. Create a unit test getting the logger and logging an error message and a debug message.
3. Observe only the error message during runtime.

Thank you.