Pass viz type to GET requests

[betodealmeida]

SUMMARY

We need to pass the visualization type to the initial GET request in the Explore view, since the payload is dependent on it.

TEST PLAN

We had a problem where:

1. User would create a new chart in Explore, using table view.
2. User would switch to a different visualization type.
3. Client would run a GET based only on the slice id, returning the wrong payload type. In our case, the Mapbox API key was not sent.

I changed the GET request to pass the visualization type. Another alternative might be to not use GET requests in the Explore view, at the cost of the initial load being slow. I'll monitor this during the first days of GA.

ADDITIONAL INFORMATION

[ ] Has associated issue:
[ ] Changes UI
[ ] Requires DB Migration. Confirm DB Migration upgrade and downgrade tested.
[ ] Introduces new feature or API
[ ] Removes existing feature or API
[X] Fixes bug
[ ] Refactors code
[ ] Adds test(s)

REVIEWERS

@xtinec

[codecov-io]

Codecov Report

Merging #7255 into lyftga will increase coverage by 0.04%.
The diff coverage is 66.66%.

@@            Coverage Diff            @@
##           lyftga   #7255      +/-   ##
=========================================
+ Coverage   64.55%   64.6%   +0.04%     
=========================================
  Files         425     425              
  Lines       20870   20891      +21     
  Branches     2282    2296      +14     
=========================================
+ Hits        13472   13496      +24     
+ Misses       7272    7269       -3     
  Partials      126     126

Impacted Files	Coverage Δ
superset/views/utils.py	88.09% <100%> (ø)	⬆️
superset/assets/src/explore/exploreUtils.js	75.72% <50%> (-0.75%)	⬇️
...assets/src/visualizations/deckgl/layers/common.jsx	62.29% <0%> (+28.14%)	⬆️

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