refactor: rename whitelisted_return_urls to allowed_return_urls

[aeneasr]

BREAKING CHANGE: Configuration key selfservice.whitelisted_return_urls has been renamed to allowed_return_urls.

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security. vulnerability, I
  confirm that I got green light (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Merging #2299 (6617992) into master (e1e7516) will not change coverage.
The diff coverage is 96.00%.

❗ Current head 6617992 differs from pull request most recent head 14cff83. Consider uploading reports for the commit 14cff83 to get more accurate results

@@           Coverage Diff           @@
##           master    #2299   +/-   ##
=======================================
  Coverage   76.56%   76.56%           
=======================================
  Files         318      318           
  Lines       17148    17148           
=======================================
  Hits        13129    13129           
  Misses       3087     3087           
  Partials      932      932           

Impacted Files	Coverage Δ
driver/config/config.go	81.69% <80.00%> (ø)
selfservice/flow/login/flow.go	96.49% <100.00%> (ø)
selfservice/flow/login/handler.go	80.48% <100.00%> (ø)
selfservice/flow/login/hook.go	89.01% <100.00%> (ø)
selfservice/flow/logout/handler.go	83.58% <100.00%> (ø)
selfservice/flow/recovery/flow.go	93.44% <100.00%> (ø)
selfservice/flow/registration/flow.go	100.00% <100.00%> (ø)
selfservice/flow/registration/hook.go	84.15% <100.00%> (ø)
selfservice/flow/settings/flow.go	93.22% <100.00%> (ø)
selfservice/flow/settings/hook.go	72.80% <100.00%> (ø)
... and 3 more

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