PageInfo: fix post-import interwiki links

[agoujot]

Given MW auto redirects valid interwiki prefixes, the solution ended up being very easy.

Bug: T330941

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.04%. Comparing base (4b8eb28) to head (595f5d9).
Report is 94 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #545      +/-   ##
============================================
- Coverage     71.30%   71.04%   -0.27%     
- Complexity     1275     1298      +23     
============================================
  Files            46       46              
  Lines          3792     3913     +121     
============================================
+ Hits           2704     2780      +76     
- Misses         1088     1133      +45     

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