Handle one file at a time in local symbolization.

[aalexand]

This allows only keeping a single objfile open to reduce the amount of consumes memory.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 40.35088% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 66.66%. Comparing base (0ed6a68) to head (6b6ff20).
Report is 11 commits behind head on main.

Files	Patch %	Lines
internal/symbolizer/symbolizer.go	40.35%	24 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #848      +/-   ##
==========================================
- Coverage   66.86%   66.66%   -0.21%     
==========================================
  Files          44       44              
  Lines        9824     9791      -33     
==========================================
- Hits         6569     6527      -42     
- Misses       2794     2802       +8     
- Partials      461      462       +1     

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[blakej11]

LGTM