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 80 lines in your changes missing coverage. Please review.

Project coverage is 20.06%. Comparing base (8b163cd) to head (286b524).
Report is 1 commits behind head on develop.

Files	Patch %	Lines
packages/frontend/src/pages/tag.note.vue	0.00%	34 Missing and 1 partial ⚠️
packages/frontend/src/pages/tag.vue	0.00%	34 Missing ⚠️
packages/frontend/src/pages/tag.user.vue	0.00%	5 Missing ⚠️
packages/frontend/src/pages/explore.users.vue	0.00%	2 Missing ⚠️
packages/frontend/src/router/definition.ts	0.00%	2 Missing ⚠️
...s/global/MkMisskeyFlavoredMarkdown.stories.impl.ts	0.00%	1 Missing ⚠️
...src/components/global/MkMisskeyFlavoredMarkdown.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #13868       +/-   ##
============================================
- Coverage    38.78%   20.06%   -18.73%     
============================================
  Files         1544      723      -821     
  Lines       190344   100255    -90089     
  Branches      2402     1051     -1351     
============================================
- Hits         73834    20118    -53716     
+ Misses      115947    79594    -36353     
+ Partials       563      543       -20     

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[kakkokari-gtyih]

konfurikuto kaisho

[kakkokari-gtyih]

コンフリクト解消（ #13859 (comment) ）