Make file + line members of InlineInfo required

[d-e-s-o]

With commit cda702e ("Introduce InlineInfo::skip() helper for Gsym logic") we simplified some of the Gsym inline parsing logic. As a result of this change, we don't actually need the call_file & call_line member of the InlineInfo type to be optional. So make them required now.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.52%. Comparing base (bf0766b) to head (4b5521d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1554      +/-   ##
==========================================
+ Coverage   95.50%   95.52%   +0.02%     
==========================================
  Files          56       56              
  Lines        9551     9549       -2     
==========================================
  Hits         9122     9122              
+ Misses        429      427       -2     

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