Update Azure AD B2C base URL to match updated endpoints

[zchoate]

Proposed changes

This is similar to PR 459. I kept the policy name as an extra argument. This appears to be the default endpoint suggested by Azure AD B2C which is probably less confusing. I also made the b2clogin.com endpoint using the authority_host property. I have updated the corresponding tests as well as the docker-compose.yml to test with these Python versions: 3.6.12 3.7.16 3.8.16 3.9.16 3.10.10 3.11.2. I have documentation updates drafted and I can propose those changes if this PR is accepted.

Documentation for the endpoints can be found here: https://docs.microsoft.com/en-us/azure/active-directory-b2c/b2clogin

As proposed the base_url would be https://{tenant_name}.{authority_host}/{tenant_name}.onmicrosoft.com where tenant_name is required but authority_host will default to b2clogin.com if not set. The policy argument will still get added so an example URL for keys would look like this https://footenant.b2clogin.com/footenant.onmicrosoft.com/discovery/v2.0/keys?p=b2c_1_signin.

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• Release (new release request)
• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
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• Refactoring (no functional changes, no api changes)
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Other information

SOCIAL_AUTH_AZUREAD_B2C_OAUTH2_TENANT_ID is updated to SOCIAL_AUTH_AZUREAD_B2C_OAUTH2_TENANT_NAME

[codecov]

Codecov Report

Merging #777 (3c52baa) into master (d1d91ae) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #777      +/-   ##
==========================================
+ Coverage   77.34%   77.35%   +0.01%     
==========================================
  Files         325      325              
  Lines        9864     9871       +7     
  Branches     1174     1176       +2     
==========================================
+ Hits         7629     7636       +7     
  Misses       2084     2084              
  Partials      151      151              

Flag	Coverage Δ
unittests	77.35% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
social_core/backends/azuread_b2c.py	82.50% <100.00%> (+1.67%)	⬆️
social_core/tests/backends/test_azuread_b2c.py	100.00% <100.00%> (ø)

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[nijel]

Merged, thanks for your contribution!