extend region timeline overview

[pindge]

fix #305 and #387

Scope:

• Add a test product and datasets with regions
• add assertion test to check product selection menu date displaying only date with datasets
• add product region date selector filter for the selected region
• add region summary years count for non-annual product

[codecov]

Codecov Report

❌ Patch coverage is 97.72727% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.54%. Comparing base (1af8c56) to head (64eaae1).
⚠️ Report is 565 commits behind head on develop.

Files with missing lines	Patch %	Lines
cubedash/summary/_stores.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #388      +/-   ##
===========================================
+ Coverage    86.41%   86.54%   +0.12%     
===========================================
  Files           25       25              
  Lines         3121     3158      +37     
===========================================
+ Hits          2697     2733      +36     
- Misses         424      425       +1     

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[pindge]

needing some help from sqlalchemy sqlalchemy/sqlalchemy#8131