Improve backend/apps/ai/common test coverage

[arkid15r]

Is your feature request related to a problem? Please describe.

Currently we have (ses #613):

apps/ai/common/constants.py                                                        3      3      0      0   0.00%   3-5
apps/ai/common/utils.py                                                           17     17      2      0   0.00%   3-64

Describe the solution you'd like
improve coverage to 80%+ target.

Are you going to work on implementing this?

• Yes
• No

[anujpundir999]

I can work on this , please assign it to me, and I want to work on #1802 as well
, can we have a level 3 label on #1802 because there are 21 file to create .
I am enjoying this open source journey and I am looking forward to help wherever needed.

[anujpundir999]

@arkid15r , Please Correct me if I am wrong . I was going through the api/common/utils.py and then i found that maybe there is rate limiting bug as time_since_last_request is almost always equal to DEFAULT_LAST_REQUEST_OFFSET_SECONDS (constant) because both are calculated relative to now.