chore: Sync migrations of prod and code

[iamareebjamal]

Fix for #6516

Now, there is just one unsynched schema in migrations event slug constraint. Next step will be fixing that and also fixing the migrations from past as in #6590

[codecov]

Codecov Report

Merging #7354 into development will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development    #7354   +/-   ##
============================================
  Coverage        64.08%   64.08%           
============================================
  Files              259      259           
  Lines            13114    13114           
============================================
  Hits              8404     8404           
  Misses            4710     4710           

Impacted Files	Coverage Δ
app/models/panel_permission.py	90.00% <ø> (ø)
app/models/event.py	78.34% <100.00%> (ø)
app/models/session_speaker_link.py	90.90% <100.00%> (ø)
app/models/speaker.py	97.61% <100.00%> (ø)

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