Added logic to delete old profile image as user add new profile image

[vrundraval24]

Fixes #200

Description

I added logic to delete the old profile image of the user from storage as the user change or add a new profile image. This way we can maintain the usage of Storage and reduce the redundancy of profile images.

I tried other ways like storing image using user uid or email but it didn't work well so at last,

I created a new attribute in User Docs in the Database to store the UserProfileImageID and used it to delete the Old user image.
I used DateTime millieSecondsSinceEpoch as a Unique ID for the profile image.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Everything at the front end and the database works fine. Shared some screenshots and screen-recording to review the changes.

Screen recordings

screen.recording.mp4

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes Improve Profile Image storing logic to manage redundancy of profile images in Storage #200
• Tag the PR with the appropriate labels

@chandansgowda Please review this.

[chandansgowda]

Don't you think in some cases that two people can have the same profileimage id ?

[chandansgowda]

Let's change this to log or just delete the line.

[vrundraval24]

@chandansgowda The Requested changes are made. Please review them.

[chandansgowda]

Great job @vrundraval24 🙌