### Apache Airflow version

2.5.1

### What happened

We're using an Azure OAUTH based login in our Airflow implementation, and everything works great. This is more of a visual problem than an actual bug.

In the Audit logs, the `owner` key is mapped to the username, which in most cases is airflow. But, in situations where we manually pause a DAG or enable it, it is mapped to our generated username, which doesn't really tell one who it is unless they were to look up that string in the users list. Example:

![image](https://user-images.githubusercontent.com/102953522/220382349-102f897b-52c4-4a92-a3e1-5b8a1b1082ff.png)

It would be nice if it were possible to include the user's first and last name alongside the username. I could probably give this one a go myself, if I could get a hint on where to look.

I've found the dag_audit_log.html template, but not sure where to change log.owner. 

### What you think should happen instead

It would be good to get a representation such as username (FirstName LastName).

### How to reproduce

N/A

### Operating System

Debian GNU/Linux 11

### Versions of Apache Airflow Providers

_No response_

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

Deployed with Helm chart v1.7.0, and Azure OAUTH for login.

### Anything else

_No response_

### Are you willing to submit PR?

- [x] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

#
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from __future__ import annotations
import functools
import gzip
import json
import logging
from io import BytesIO as IO
from itertools import chain
from typing import Callable, TypeVar, cast
import pendulum
from flask import after_this_request, g, request
from pendulum.parsing.exceptions import ParserError
from airflow.models import Log
from airflow.utils.log import secrets_masker
from airflow.utils.session import create_session
T = TypeVar("T", bound=Callable)
logger = logging.getLogger(__name__)
def _mask_variable_fields(extra_fields):