fix: #3583216 Backport path prefix handling and same-host SSO skip

Frank Mablyrequested to merge
issue/domain_extras-3583216:3583216-domainssoadmintoolbar-fix-path-2.0.x into 2.0.x

Backport of MR 29 (3.x) to 2.0.x:

  • Use processInbound() to strip all path prefixes (domain, language) from the referer before building the target URL.
  • Skip SSO handshake when source and target domains share the same hostname (session cookies are shared).

Note: the IssueController 'domain' route option change is not backported as domain 2.x does not support this option.

Closes #3583216

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