[TASK] Replace Integration tests with xmllint #2094

Job	Run time
Check architecture	16s
Coding Standards	18s
xml-lint	17s
Code Coverage / Code Coverage	2m 24s
Lint root / Lint yaml & Composer (8.2)	10s
Static analysis / Static Code Analysis (8.2)	33s
Unit test / Tests (8.1, lowest)	31s
Unit test / Tests (8.1, locked)	20s
Unit test / Tests (8.1, highest)	28s
Unit test / Tests (8.2, lowest)	29s
Unit test / Tests (8.2, locked)	14s
Unit test / Tests (8.2, highest)	26s
Functional test / Tests (8.1, lowest)	36s
integration test / Tests (8.1, lowest)	1m 6s
Functional test / Tests (8.1, locked)	34s
integration test / Tests (8.1, locked)	23s
integration test / Tests (8.1, highest)	43s
Functional test / Tests (8.1, highest)	45s
integration test / Tests (8.2, lowest)	1m 6s
Functional test / Tests (8.2, lowest)	38s
integration test / Tests (8.2, locked)	23s
Functional test / Tests (8.2, locked)	20s
integration test / Tests (8.2, highest)	1m 7s
Functional test / Tests (8.2, highest)	39s
	14m 46s

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