fix: Validate organizer details form correctly

[ShridharGoel]

Fixes #1413

Checklist:

• I have checked for PMD and check-style issues
• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.

Changes:

Now organizer details will be validated properly. First and last name are no longer compulsory and email is now compulsory.

[codecov]

Codecov Report

Merging #1414 into development will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             development    #1414   +/-   ##
==============================================
  Coverage          24.45%   24.45%           
  Complexity           757      757           
==============================================
  Files                237      237           
  Lines               8658     8658           
  Branches             351      351           
==============================================
  Hits                2117     2117           
  Misses              6458     6458           
  Partials              83       83

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