sdk/basyx/aas/adapter/xml/xml_serialization.py: Remove code duplication #906

Job	Run time
check-python-versions	9s
sdk-test (3.9)	33s
sdk-test (3.12)	34s
compliance-tool-package	16s
compliance-tool-static-analysis	27s
sdk-static-analysis	28s
sdk-docs	26s
server-static-analysis	29s
repository-check-copyright	10s
sdk-package	15s
server-package	50s
compliance-tool-test (3.9)	40s
compliance-tool-test (3.12)	45s
sdk-readme-codeblocks	22s
	6m 24s

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