fix(auth): UserCancelledException occurrence on sign-in after sign-out

[cadivus]

Issue #, if available:
#3167

Description of changes:
This change makes the webview create a new session every time a new sign-in window gets launched. This way, a browser-session is not used for multiple Cognito sessions.

How did you test these changes?
I created a simple app for logging in with Cognito and a SAML provider.

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(storage): message, feat(auth): message, chore(all): message)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 54.78%. Comparing base (694dac0) to head (f9960e8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3169   +/-   ##
=======================================
  Coverage   54.78%   54.78%           
=======================================
  Files        1048     1048           
  Lines       31329    31330    +1     
  Branches     4690     4691    +1     
=======================================
+ Hits        17163    17165    +2     
+ Misses      12357    12356    -1     
  Partials     1809     1809           

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