[PR #2374/f4faf422 backport][stable-4.10] Init django-flags

[patchback]

This is a backport of PR #2374 as merged into master (f4faf42).

Issue: AAP-35418

Add django-flags dependancy to Hub component.

verifications:

1. add MY_FLAG to FLAGS in galaxy_ng/app/settings.py

FLAGS = {
    "MY_FLAG": []
}

2. enable, disable flag and verify state

> docker compose -f dev/compose/aap.yaml exec manager /bin/bash
bash-4.4# django-admin enable_flag MY_FLAG
Successfully enabled MY_FLAG

bash-4.4# pulpcore-manager shell
Python 3.11.10 (main, Sep 24 2024, 09:33:51) [GCC 8.5.0 20210514 (Red Hat 8.5.0-22)]
Type 'copyright', 'credits' or 'license' for more information
IPython 8.29.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: from flags.state import flag_state, enable_flag, disable_flag

In [2]: flag_state('MY_FLAG')
Out[2]: True

In [3]: disable_flag('MY_FLAG')

In [4]: flag_state('MY_FLAG')
Out[4]: False

(django-flags in EDA: ansible/eda-server#1135)

[app-sre-bot]

Can one of the admins verify this patch?