feat(AC2): Added support for elective preregistration and corrected preregistration process

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Implemented Elective Pre Registration Process.
Changed the way how preregistation data is directly stored in Final Registration table and Course Registration table and now it is only stored in Initial Registration table.

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[ ] Bugfix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] Other (please describe):

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[x] My code follows the style guidelines of this project
[x] I have performed a self-review of my own code
[ ] I have created new branch for this pull request
[ ] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the documentation
[x] My changes generate no new warnings
[ ] My changes does not break the current system and it passes all the current test cases.

Screenshot from 2024-10-21 20-06-28

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