Re-enable integration tests once breaking changes absorbed

[toddbaert]

Flagd needs to absorb the breaking changes before it can be used in the repos. Leaving this as a placeholder for myself to do this.

• uncomment integration-test maven profile in workflow
• uncomment flagd initialization in StepDefinitions.java
• add latest flagd back to pom:

    <dependency>
      <groupId>dev.openfeature.contrib.providers</groupId>
      <artifactId>flagd</artifactId>
      <version>X.X.X</version>
      <scope>test</scope>
    </dependency>