refactor: omit embedded field from accessor chain

[G-Rath]

This slightly reduces coupling since the caller does not have to know about the embedded field in the middle, in addition to just overall being less code

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.41379% with 8 lines in your changes missing coverage. Please review.

Project coverage is 65.69%. Comparing base (7887941) to head (4ae53cc).

Files with missing lines	Patch %	Lines
internal/imodels/imodels.go	85.71%	0 Missing and 2 partials ⚠️
internal/resolution/manifest/maven.go	50.00%	1 Missing and 1 partial ⚠️
cmd/osv-scanner/fix/noninteractive.go	0.00%	0 Missing and 1 partial ⚠️
internal/tui/in-place-info.go	0.00%	1 Missing ⚠️
internal/tui/vuln-list.go	0.00%	1 Missing ⚠️
pkg/osvscanner/osvscanner.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1925   +/-   ##
=======================================
  Coverage   65.69%   65.69%           
=======================================
  Files         166      166           
  Lines       16058    16058           
=======================================
  Hits        10550    10550           
  Misses       4842     4842           
  Partials      666      666           

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