perf: skip reading backend-meta files if they do not exist

[jdx]

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.10%	✅ 70.59%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e13543a)	19748	15303	77.49%
Head commit (65e4ffe)	19761 (+13)	15332 (+29)	77.59% (+0.10%)

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 (#2941)	17	12	70.59%

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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