chore(ci): remove legacy chart repo #12356

Job	Run time
Detect which file has changed	9s
javascript-lint	6s
action-lint	5s
helm-lint	0s
infrahub-poetry-check	0s
markdown-lint	0s
python-lint	0s
yaml-lint	10s
backend-benchmark	0s
backend-tests-unit	0s
backend-tests-integration	0s
backend-validate-generated	0s
documentation	0s
E2E-testing-invoke-demo-start	0s
E2E-testing-playwright	18m 40s
frontend-tests	0s
validate-documentation-style	0s
validate-generated-documentation	0s
coverall-report	2s
	19m 12s

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