Create a charm action to run wp core update db after a wordpress upgrade #904

Job	Run time
Integration Test / Plan	4s
Integration Test / Build charm (wordpress-k8s)	4m 44s
Integration Test / Build rock (wordpress)	8m 57s
Integration Test / Plan Image Scanning	3s
Integration Test / Integration tests / Integration tests (test_addon)	18m 38s
Integration Test / Integration tests / Integration tests (test_core)	12m 10s
Integration Test / Integration tests / Integration tests (test_external)	15m 3s
Integration Test / Integration tests / Integration tests (test_ingress)	16m 4s
Integration Test / Integration tests / Integration tests (test_cos_grafana)	12m 56s
Integration Test / Integration tests / Integration tests (test_cos_loki)	16m 30s
Integration Test / Integration tests / Integration tests (test_cos_prometheus)	13m 44s
Integration Test / Scan Image (ghcr.io-canonical-wordpress-82efb77181a72470e40123f26350f191b28e3ee9-_1.0_amd64.tar)	1m 48s
Integration Test / Required Integration Test Status Checks	1s
	2h 0m 42s

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