Tests

Add end2end testing for examples #406

Job	Run time
Test suite json	53s
Test hello_world_actix example	6m 30s
Test suite yaml	58s
Test counter example	7m 50s
Test leptos_i18n package	3m 59s
Test hello_world_axum example	6m 22s
Test counter_plurals example	7m 0s
Test suite namespaces	52s
Test leptos_i18n_macro package	10m 20s
Test workspace example	6m 38s
Test interpolation example	7m 5s
Test axum_island example	6m 16s
Test namespaces example	7m 2s
Test subkeys example	6m 51s
Test yaml example	6m 51s
	1h 25m 27s

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