Update TUF status generation to use new TUF repository

[lucasmrod]

For #25853.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.59%. Comparing base (c81117b) to head (e351ea0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #26099      +/-   ##
==========================================
- Coverage   63.59%   63.59%   -0.01%     
==========================================
  Files        1631     1631              
  Lines      156402   156402              
  Branches     4088     4088              
==========================================
- Hits        99471    99465       -6     
- Misses      49093    49097       +4     
- Partials     7838     7840       +2     

Flag	Coverage Δ
backend	64.43% <ø> (-0.01%)	⬇️

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