fix: CarouselSlidePlugin and TabItemPlugin template retrieval to respect parent template setting #1532

Job	Run time
coverage (3.9, dj42_cms41.txt, ubuntu-latest)	53s
coverage (3.10, dj42_cms41.txt, ubuntu-latest)	51s
coverage (3.11, dj52_cms50.txt, ubuntu-latest)	57s
coverage (3.11, dj50_cms41.txt, ubuntu-latest)	40s
coverage (3.10, dj51_cms41.txt, ubuntu-latest)	57s
coverage (3.9, dj42_cms311.txt, ubuntu-latest)	36s
coverage (3.11, dj42_cms311.txt, ubuntu-latest)	1s
coverage (3.11, dj51_cms41.txt, ubuntu-latest)	57s
coverage (3.10, dj42_cms311.txt, ubuntu-latest)	58s
coverage (3.10, dj50_cms41.txt, ubuntu-latest)	57s
coverage (3.13, dj50_cms41.txt, ubuntu-latest)	59s
coverage (3.12, dj51_cms41.txt, ubuntu-latest)	59s
coverage (3.13, dj42_cms41.txt, ubuntu-latest)	57s
coverage (3.12, dj42_cms41.txt, ubuntu-latest)	1s
coverage (3.13, dj52_cms50.txt, ubuntu-latest)	57s
coverage (3.12, dj52_cms50.txt, ubuntu-latest)	58s
coverage (3.13, dj51_cms41.txt, ubuntu-latest)	58s
coverage (3.12, dj50_cms41.txt, ubuntu-latest)	58s
coverage (3.11, dj42_cms41.txt, ubuntu-latest)	1s
	14m 35s

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