test: add percentage-based tolerance for image size verification #6659

Job	Run time
changes	18s
code-checks / changes	17s
code-checks / lint (3.10)	57s
code-checks / run-tests-core (3.10)	8m 38s
code-checks / run-tests-ml (3.10, ocr)	7m 8s
code-checks / run-tests-ml (3.10, vlm)	2m 12s
code-checks / run-tests-ml (3.10, pdf-model)	5m 21s
code-checks / run-tests-ml (3.10, asr)	2m 22s
code-checks / run-tests-macos	-1s
code-checks / test-pip-install-no-lock	0s
code-checks / run-examples-light	-1s
code-checks / run-tests-windows	-1s
code-checks / test-pip-install-no-dev-headers	0s
code-checks / build-package	0s
code-checks / tach	-1s
code-checks / test-package	0s
code-checks / check	8s
ci-status	2s
	27m 19s

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