### Body

We had an issue where extra link class (`AIPlatformConsoleLink`) was removed in [PR](https://github.com/apache/airflow/pull/26836) without removing the class from the `provider.yaml` extra links this resulted in web server exception as shown in https://github.com/apache/airflow/pull/28449


**The Task:**
Add validation that classes of extra-links in provider.yaml are importable

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
operating_system = OperatingSystem.get_current()
        arch = Architecture.get_current()
        uname = platform.uname()
        _locale = locale.getdefaultlocale()
        python_location = self.anonymizer.process_path(sys.executable)
        python_version = sys.version.replace("\n", " ")
        return [
            ("OS", operating_system or "NOT AVAILABLE"),
            ("architecture", arch or "NOT AVAILABLE"),
            ("uname", str(uname)),
            ("locale", str(_locale)),
            ("python_version", python_version),
            ("python_location", python_location),
        ]
    @property
    def _tools_info(self):