fix(converter): preserve numbering.xml definitions on round-trip (SD-2911) #2275

Job	Run time
build	2m 28s
smoke-test (docxtemplater)	48s
smoke-test (contract-templates)	1m 28s
smoke-test (nextjs-ssr)	1m 10s
smoke-test (loading-from-json)	45s
smoke-test (linked-sections)	53s
smoke-test (text-selection)	41s
smoke-test (toolbar)	43s
smoke-test (grading-papers)	45s
smoke-test (fields)	46s
smoke-test (custom-ui)	38s
smoke-test (docx-from-html)	44s
CI Demos / validate	4s
	11m 53s

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