### Apache Airflow version

2.2.0b1 (beta snapshot)

### Operating System

Mac OSX 11.5.2

### Versions of Apache Airflow Providers

_No response_

### Deployment

Docker-Compose

### Deployment details

_No response_

### What happened

In the tree view, the status color for deferred is very difficult to distinguish from up_for_reschedule and is generally not very distinct. I can’t imagine it’s good for people with colorblindness either.

### What you expected to happen

I expect the status colors to form a distinct palette. While there is already some crowding in the greens, I don't want to see it get worse with the new status.

### How to reproduce

Make a deferred task and view in tree view.

### Anything else

I might suggest something in the purple range like [BlueViolet #8A2BE2](https://www.color-hex.com/color/8a2be2)


### 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)

airflow/settings.py
"""Properly close pooled database connections"""
    log.debug("Disposing DB connection pool (PID %s)", os.getpid())
    global engine
    global Session
    if Session:
        Session.remove()
        Session = None
    if engine:
        engine.dispose()
        engine = None
def configure_adapters():
    """Register Adapters and DB Converters"""
    from pendulum import DateTime as Pendulum
    try:
        from sqlite3 import register_adapter
        register_adapter(Pendulum, lambda val: val.isoformat(' '))
    except ImportError:
        pass
    try:
        import MySQLdb.converters
        MySQLdb.converters.conversions[Pendulum] = MySQLdb.converters.DateTime2literal
    except ImportError:
        pass
    try:
        import pymysql.converters
        pymysql.converters.conversions[Pendulum] = pymysql.converters.escape_datetime
    except ImportError:
        pass
def validate_session():