Do not add My Domain from Welcome Discovery

[brandonpage]

Two big changes:

1. Do not persist the My Domain url chosen by the user from Welcome Discovery.
2. Pass the selected My Domain to fetchAuthenticationConfiguration so it eventually gets set as the login server on the created user account.

[github-actions]

	1 Warning
⚠️	libs/SalesforceSDK/src/com/salesforce/androidsdk/ui/LoginActivity.kt#L668 - Switch statement on an int with known associated constant missing case BiometricManager.BIOMETRIC_ERROR_IDENTITY_CHECK_NOT_ACTIVE

Generated by 🚫 Danger

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.41%. Comparing base (7ef093b) to head (62c68c3).
⚠️ Report is 2 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #2909      +/-   ##
============================================
- Coverage     66.58%   66.41%   -0.18%     
+ Complexity     3108     3099       -9     
============================================
  Files           226      226              
  Lines         17871    17872       +1     
  Branches       2339     2340       +1     
============================================
- Hits          11899    11869      -30     
- Misses         4887     4923      +36     
+ Partials       1085     1080       -5     

Components	Coverage Δ
Analytics	48.71% <ø> (ø)
SalesforceSDK	62.57% <100.00%> (-0.32%)	⬇️
Hybrid	59.30% <ø> (ø)
SmartStore	78.22% <ø> (ø)
MobileSync	82.12% <ø> (ø)

Files with missing lines	Coverage Δ
.../salesforce/androidsdk/app/SalesforceSDKManager.kt	61.57% <100.00%> (-0.28%)	⬇️
.../src/com/salesforce/androidsdk/ui/LoginActivity.kt	42.16% <100.00%> (-4.02%)	⬇️
...src/com/salesforce/androidsdk/ui/LoginViewModel.kt	89.24% <100.00%> (-0.36%)	⬇️

... and 2 files with indirect coverage changes

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