IWYU fixes

[dagardner-nv]

Description

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[dagardner-nv]

/merge

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.17%. Comparing base (fff44d6) to head (985f821).
Report is 1 commits behind head on branch-24.10.

Additional details and impacted files

@@              Coverage Diff              @@
##           branch-24.10     #517   +/-   ##
=============================================
  Coverage         74.17%   74.17%           
=============================================
  Files               407      407           
  Lines             15049    15049           
  Branches           1191     1191           
=============================================
  Hits              11163    11163           
  Misses             3886     3886           

Flag	Coverage Δ
cpp	70.72% <ø> (ø)
py	44.23% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
python/mrc/_pymrc/src/segment.cpp	80.82% <ø> (ø)
python/mrc/core/coro.cpp	100.00% <ø> (ø)

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