fix: restoration of deleted event

[shreyanshdwivedi]

Fixes #6147

Short description of what this resolves:

Restoration of a deleted event fails

Changes proposed in this pull request:

• Removes validate_date on event schema
• Adds a function validate_event as programmatic check
• Skips validation of date on the update of deleted events

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

[codecov]

Codecov Report

Merging #6218 into development will decrease coverage by 0.14%.
The diff coverage is 12.5%.

@@               Coverage Diff               @@
##           development    #6218      +/-   ##
===============================================
- Coverage        65.86%   65.71%   -0.15%     
===============================================
  Files              287      286       -1     
  Lines            14559    14523      -36     
===============================================
- Hits              9589     9544      -45     
- Misses            4970     4979       +9

Impacted Files	Coverage Δ
app/api/schema/events.py	91.72% <ø> (+1.79%)	⬆️
app/api/events.py	25.13% <12.5%> (-0.81%)	⬇️

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[iamareebjamal]

Have a peer review

[shreyanshdwivedi]

@mrsaicharan1 @uds5501 @kushthedude please review

[shreyanshdwivedi]

@uds5501 @mrsaicharan1 pleas review