feat/113 remove total count

[minjun3021]

What is this PR?

• Github Issue: API Response 페이지네이션 totalElements 반환 방식 논의 #113
  totalelements field를 없엤고
  pagenation시 발생하는 count query 제거

Key Changes

Test Checklist

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (25bd54f) 84.69% compared to head (8a83c29) 82.60%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #124      +/-   ##
============================================
- Coverage     84.69%   82.60%   -2.10%     
+ Complexity      152      147       -5     
============================================
  Files            42       42              
  Lines           732      730       -2     
  Branches         31       31              
============================================
- Hits            620      603      -17     
- Misses           91      104      +13     
- Partials         21       23       +2     

Files	Coverage Δ
...up4/ticketingservice/controller/EventController.kt	100.00% <ø> (ø)
...lin/com/group4/ticketingservice/dto/ResponseDTO.kt	100.00% <100.00%> (ø)
...om/group4/ticketingservice/service/EventService.kt	100.00% <100.00%> (ø)
...om/group4/ticketingservice/utils/ResponseAdvice.kt	54.02% <100.00%> (-17.57%)	⬇️

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