refactor(tags): remove dependency on mat_views.authors_lasts

[gary02]

• remove unused mat_views sql scripts
• refactor TagService.findByAuthorUsage to not query mat_views.authors_tags (resolve https://github.com/thematters/developer-resource/issues/440)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 58.66%. Comparing base (08444f2) to head (67b56e6). Report is 1 commits behind head on develop.

Files	Patch %	Lines
src/connectors/tagService.ts	0.00%	6 Missing :warning:
src/queries/user/tags/tagsUsageRecommendation.ts	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #4001 +/- ## =========================================== - Coverage 58.74% 58.66% -0.09% =========================================== Files 886 886 Lines 17178 17175 -3 Branches 3071 3138 +67 =========================================== - Hits 10091 10075 -16 - Misses 7036 7049 +13 Partials 51 51 ```

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