feat: Introduce compatibility with native namespace packages #2890

Job	Run time
docs	34s
goldens-lint	3m 45s
fragment (3.7)	2m 22s
integration	16m 45s
fragment (3.7, _alternative_templates)	1m 42s
fragment (3.8)	3m 3s
fragment (3.8, _alternative_templates)	2m 25s
mypy	37s
fragment (3.9)	1m 35s
showcase (showcase)	1m 8s
showcase-mtls	0s
fragment (3.9, _alternative_templates)	1m 57s
showcase (showcase_alternative_templates)	50s
fragment (3.10)	1m 37s
showcase-mypy	43s
fragment (3.10, _alternative_templates)	1m 38s
showcase-mypy (_alternative_templates)	46s
fragment (3.11)	1m 39s
fragment (3.11, _alternative_templates)	2m 10s
showcase-unit-add-iam-methods	48s
showcase-unit (3.7)	1m 22s
snippetgen	40s
showcase-unit (3.7, _alternative_templates)	1m 20s
style-check	10s
showcase-unit (3.7, _mixins)	50s
unit (3.7)	43s
showcase-unit (3.7, _alternative_templates_mixins)	47s
unit (3.8)	59s
showcase-unit (3.8)	59s
unit (3.9)	39s
unit (3.10)	43s
showcase-unit (3.8, _alternative_templates)	45s
unit (3.11)	37s
showcase-unit (3.8, _mixins)	1m 0s
showcase-unit (3.8, _alternative_templates_mixins)	46s
showcase-unit (3.9)	57s
showcase-unit (3.9, _alternative_templates)	43s
showcase-unit (3.9, _mixins)	49s
showcase-unit (3.9, _alternative_templates_mixins)	44s
showcase-unit (3.10)	47s
showcase-unit (3.10, _alternative_templates)	1m 9s
showcase-unit (3.10, _mixins)	51s
showcase-unit (3.10, _alternative_templates_mixins)	57s
showcase-unit (3.11)	46s
showcase-unit (3.11, _alternative_templates)	47s
showcase-unit (3.11, _mixins)	51s
showcase-unit (3.11, _alternative_templates_mixins)	44s
	1h 8m 29s

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