fix: change the authentication URL regexp for Auth0 provider

[maintux]

Changelog

• authentication URL regexp for Auth0 provider

Bugfixes

At the moment, the regexp used to check if the URL is an authentication URL for Auth0 checks if /samlp is in the URL. The correct one instead checks if /u/login is present.
This misconfiguration causes the opening of the login modal window for every credential refresh process because the needAuthentication method always resolves with true.

[sonarcloud]

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[Giaco9]

Hi everyone,
do you have any timeline for releasing this? I'm currently using Auth0 as an identity provider, and the bug this PR would solve is really annoying. I checked the pull-request #321, and it has the same failed check about "Incomplete regular expression for hostnames", but has been merged without a fix. Maybe @rick-rtt could help also this time? If needed I can help in testing this :)

Thank you again @maintux and the Leapp team, as #321 this pull-request would really helpful for me :)

[andreacavagna01]

We are going to release this feature this week! thanks for the support guys!