dagre: set rank better for container-container edges

[alixander]

i think we can do this a lot better actually by using this minlen

https://play.d2lang.com/?script=zFNNb5wwFLz7V0w3am9hUbRVJB8qseCkkbqAgO2pF3fjZi2ZD2HTtKr47xXmcxN6bm54_Dxv3sxj8pzisXwuSJxEwdFnCcUfAtge_ScwPaQwdSMsNjtN8XyWZkClUhTf1VB0ETnFbnpJkZdFSYCWtGRqjetP4JUkhFeSwosfELD04T7EBwTsK_sSxQcWZr2-zmwKI36ZUa2zIG4J0aezyDnFZmMfxEmURfvjHVL_Mzt442jdOlCcjak03W67k3aMqGuuTd2cjHMq863QWhRGcqXf39zdfLy9_iGVcPTPJ8swKJE5f-qHfiWmmxLgWgujx7527SisoGMcR0kGLwy-FfcsZImXsQBemrIs_RfjBFrD5wDm0jGcKYz-arlNFK69GQ471x20vjDL5nIhv-ca_oaexibJK9kV9947L2jGTLoKPwrT44El8NbA_RroE3IFv2zUI2rBlfqNRgvoMhc4qU6efkdm2sUaXzq39G1z5bquu7vdTPjKxr62dLR73dF2VrF_Eyr8_6nibwAAAP__&layout=dagre&

[alixander]

#1011 does a lot, but i still think this has potential to improve somehow, with the above property. specifically, the case where container A points to container B but container B also points to container A