ci: drop forwarded-deps-outputs

[mcocdawc]

• forwarded-deps-outputs goes: it only fed a build action, and build-hpc runs a job-script.

Rendered scripts are unchanged for every existing leg, and so are the generated cross-repo-trigger*.yml; the regenerate bot brings trigger-downstream*.yml up to date. Needed before ecmwf/ci-infrastructure#103, which removes these fields; it works on ci-infrastructure main today.

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.67%. Comparing base (b2a7cb3) to head (06a8ea7).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #586   +/-   ##
========================================
  Coverage    87.66%   87.67%           
========================================
  Files          857      857           
  Lines        64110    64110           
  Branches     11409    11409           
========================================
+ Hits         56205    56207    +2     
+ Misses        7905     7903    -2     

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