refactor(backend): use Reflect for bindThis decorator

[zzau13]

Using Reflect.defineProperty instead of Object.defineProperty gives a more consistent behavior with the rest of the modern JavaScript features.

What

Update to modern Javascript features

Why

Improve the code

Additional info (optional)

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[github-actions]

このPRによるapi.jsonの差分

差分はこちら

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.82%. Comparing base (a3d236c) to head (818b156).
Report is 80 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #14482      +/-   ##
===========================================
- Coverage    41.74%   39.82%   -1.93%     
===========================================
  Files         1549     1547       -2     
  Lines       196555   190953    -5602     
  Branches      2767     3422     +655     
===========================================
- Hits         82055    76040    -6015     
- Misses      113939   114327     +388     
- Partials       561      586      +25     

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[syuilo]

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