feat: test implementations with reusable jsons

[laurentsenta]

contributes to #123

depends on #145
example output: https://github.com/ipfs/gateway-conformance/actions/runs/5924237972/attempts/1#summary-16061404658

related:

• ci: upload conformance logs ipfs-inactive/bifrost-gateway#195
• ci: upload conformance logs kubo#10092
• ci: upload conformance logs boxo#442

[laurentsenta]

explicit failure on misconfiguration: https://github.com/ipfs/gateway-conformance/actions/runs/5924017480/job/16060746449?pr=146#logs

[galargh]

explicit failure on misconfiguration: https://github.com/ipfs/gateway-conformance/actions/runs/5924017480/job/16060746449?pr=146#logs

I think we should catch it and report success if that's what we expect. Otherwise, it's quite confusing to contributors at this point (myself included) - #147.

[laurentsenta]

I think we should catch it and report success if that's what we expect. Otherwise, it's quite confusing to contributors at this point (myself included) - #147.

@galargh agreed, I think that one error is expected: the dahboard generation could not find the output.json and failed. It does not depend on the gateway test statuses, etc.