Implement new testing strategy

[allthesignals]

Closes #549 by mocking/stubbing the mapbox-gl/composer/draw deps entirely

There are two refactors of source code that were necessary because the new testing strategy exposed some (race condition related) flaws:

1. map form extracts the map resizing method calls into a separate function that's called as needed
2. search handler component removes the bbl lookup component and accepts a markup block. bbl-lookup is passed into this block instead (for easier testability)

The rest of the changes are of course testing related

[codecov[bot]]

Codecov Report

Merging #552 into develop will decrease coverage by 1.41%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #552      +/-   ##
===========================================
- Coverage    86.89%   85.48%   -1.42%     
===========================================
  Files           74       74              
  Lines         1053     1054       +1     
===========================================
- Hits           915      901      -14     
- Misses         138      153      +15

Impacted Files	Coverage Δ
app/components/map-form.js	95.83% <100%> (-2.07%)	:arrow_down:
app/controllers/application.js	0% <0%> (-100%)	:arrow_down:
app/components/search-handler.js	70% <0%> (-20%)	:arrow_down:
app/components/project-geometries/modes/lots.js	93.87% <0%> (-6.13%)	:arrow_down:
app/components/mapbox-gl-draw.js	77.41% <0%> (-3.23%)	:arrow_down:
app/components/project-geometries/modes/draw.js	85.26% <0%> (-3.16%)	:arrow_down:
app/models/geometric-property.js	97.61% <0%> (+2.38%)	:arrow_up:

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