fix: ConsoleLogger 날짜 형식 정상화

[scarf005]

참고: https://docs.nestjs.com/techniques/logger#extend-built-in-logger

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 9.35%. Comparing base (1666820) to head (e7b5279).

Files with missing lines	Patch %	Lines
backend/src/SaneLogger.ts	0.00%	4 Missing ⚠️
backend/src/main.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #82      +/-   ##
========================================
- Coverage   9.41%   9.35%   -0.06%     
========================================
  Files         57      58       +1     
  Lines        818     823       +5     
  Branches      14      11       -3     
========================================
  Hits          77      77              
- Misses       734     746      +12     
+ Partials       7       0       -7     

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[jimin52]

로거 정상화 축하합니다