Properly handle UI Test Config.

[brandonpage]

This PR moves the expected location of the ui_test_config.json file to shared/test/ to match test_credentials.json and adds a ui_test_config.json.sample file.

[wmathurin]

There is also a users section - see https://github.com/forcedotcom/SalesforceMobileSDK-iOS/blob/dev/native/SampleApps/AuthFlowTester/AuthFlowTesterUITests/test_config.json.sample

[wmathurin]

👍 ui_test_config is a better name than test_config.
I should rename on iOS also (and change the github actions there also)

[brandonpage]

I debated that name change because I didn't know if this could potentially be used to remove all consumer keys from the repo. But we can rethink about the naming if we do that in the future.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.28%. Comparing base (47f5b94) to head (9292d6f).
⚠️ Report is 4 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #2827      +/-   ##
============================================
+ Coverage     63.06%   63.28%   +0.21%     
  Complexity     2831     2831              
============================================
  Files           215      216       +1     
  Lines         17036    16997      -39     
  Branches       2465     2414      -51     
============================================
+ Hits          10744    10756      +12     
+ Misses         5124     5072      -52     
- Partials       1168     1169       +1     

Components	Coverage Δ
Analytics	47.92% <ø> (ø)
SalesforceSDK	56.41% <29.16%> (+0.37%)	⬆️
Hybrid	59.05% <ø> (ø)
SmartStore	78.20% <ø> (ø)
MobileSync	81.68% <ø> (ø)
React	52.36% <ø> (ø)
see 4 files with indirect coverage changes

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