Feature to reactivate deactivated accounts

[Harshit28j]

Issue: Currently, users can disable their accounts but have no way to reactivate them. Create a new page that allows users to reactivate their accounts.

Fix: I have created a new page on the front-end that generates an activation link based on the user's email address. This link is then sent to the user's email address. The account will be activated only when the user clicks on the link.

[Harshit28j]

In this video, I have shown the following conditions:

1. When the account is already active
2. If the user does not exist
3. Successful account activation

activation_user_cases.mp4

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 5.26316% with 18 lines in your changes missing coverage. Please review.

Project coverage is 68.96%. Comparing base (96968d6) to head (67a9cd9).
Report is 1110 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4391      +/-   ##
==========================================
- Coverage   72.93%   68.96%   -3.97%     
==========================================
  Files          83       20      -63     
  Lines        5368     3593    -1775     
==========================================
- Hits         3915     2478    -1437     
+ Misses       1453     1115     -338     

Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	50.00% <5.26%> (-16.87%)	⬇️

... and 64 files with indirect coverage changes

Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	50.00% <5.26%> (-16.87%)	⬇️

... and 64 files with indirect coverage changes

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