Include column is_soong_module when loading installed file list

In soong-only build all installed files should be built by soong so this
field is needed when validating if there is any metadata associating
with an installed file.

Bug: 398039178
Test: presubmits
Test: build/soong/tests/sbom_test.sh
Change-Id: I185edf01dd89489d13bf31e82ec5cffcf29e5546