refactor: reuse internal helper bom_ref_from_str

[jkowalleck]

fixes #722

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
Report missing for bca1d771	✅ 100.00% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (bca1d77)	Report Missing	Report Missing	Report Missing
Head commit (c85cf3e)	4865	4548	93.48%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#727)	19	19	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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