test-cases: Add group and template for tiny image tests

lava/group-tiny-tpl.yaml

test-cases/tiny-container-system-aa-enforcement.yaml

test-cases/tiny-container-system-basic.yaml

test-cases/tiny-container-system-connectivity-profile.yaml

test-cases/tiny-container-system-device-sharing.yaml

test-cases/tiny-container-system-folder-sharing.yaml

test-cases/tiny-container-system-seccomp.yaml

test-cases/tiny-container-user-aa-enforcement.yaml

test-cases/tiny-container-user-basic.yaml

test-cases/tiny-container-user-connectivity-profile.yaml

test-cases/tiny-container-user-device-sharing.yaml

test-cases/tiny-container-user-folder-sharing.yaml

test-cases/tiny-container-user-seccomp.yaml