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

Merging #388 (64eaae1) into develop (1af8c56) will increase coverage by 0.12%.
The diff coverage is 97.72%.

@@             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     

Impacted Files	Coverage Δ
cubedash/summary/_extents.py	91.83% <ø> (ø)
cubedash/summary/_model.py	79.77% <ø> (ø)
cubedash/summary/_schema.py	81.51% <ø> (ø)
cubedash/summary/_stores.py	91.89% <97.22%> (+0.33%)	⬆️
cubedash/_model.py	93.38% <100.00%> (ø)
cubedash/_pages.py	87.39% <100.00%> (ø)
cubedash/summary/_summarise.py	96.15% <100.00%> (+0.10%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1af8c56...64eaae1. Read the comment docs.

[pindge]

needing some help from sqlalchemy sqlalchemy/sqlalchemy#8131