enhance(frontend): /tagsと/user-tagsを統合

[kakkokari-gtyih]

What

Why

Fix #13859

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

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.68%. Comparing base (bf403aa) to head (2376909).

Files	Patch %	Lines
...src/components/global/MkMisskeyFlavoredMarkdown.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #13868      +/-   ##
===========================================
- Coverage    77.84%   77.68%   -0.17%     
===========================================
  Files          185      183       -2     
  Lines        25601    25411     -190     
  Branches       487      487              
===========================================
- Hits         19930    19740     -190     
  Misses        5664     5664              
  Partials         7        7              

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[kakkokari-gtyih]

konfurikuto kaisho

[kakkokari-gtyih]

コンフリクト解消（ #13859 (comment) ）