fix(component_related_blocks): move shared logic to base cell

[verarojman]

• Improve consistency for blocks related to components
• Add spec and lint base cell
• Add component scope to upcoming meetings cell
• Use set manifest_name in component-related cells

Closes #20

Closes #29

[codecov]

Codecov Report

Patch coverage: 80.00% and project coverage change: -0.24 ⚠️

Comparison is base (0f80323) 86.78% compared to head (97409da) 86.54%.

❗ Current head 97409da differs from pull request most recent head 2299977. Consider uploading reports for the commit 2299977 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
- Coverage   86.78%   86.54%   -0.24%     
==========================================
  Files          32       32              
  Lines         507      513       +6     
==========================================
+ Hits          440      444       +4     
- Misses         67       69       +2     

Impacted Files	Coverage Δ
...ntent_blocks/alternative_upcoming_meetings_cell.rb	93.54% <50.00%> (-3.23%)	⬇️
...e_landing/content_blocks/latest_blog_posts_cell.rb	93.33% <50.00%> (-3.34%)	⬇️
...im/alternative_landing/content_blocks/base_cell.rb	96.66% <85.71%> (+0.51%)	⬆️
...lternative_upcoming_meetings_settings_form_cell.rb	100.00% <100.00%> (ø)
...ent_blocks/latest_blog_posts_settings_form_cell.rb	100.00% <100.00%> (ø)

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[microstudi]

I'd only change some memoization patterns