feat: prevent body double-read in googleapi.CheckResponse

[bjohnso5]

Call into non-reading variant of CheckResponse added here.

Fixes googleapis/google-cloud-go#11458 (part 2 of 2).

[quartzmo]

Setting do not merge label pending publication of change in googleapis/google-api-go-client#2964.

[quartzmo]

This is waiting on googleapis/google-api-go-client#2965, at which point https://pkg.go.dev/google.golang.org/api/googleapi should list CheckResponseWithBody.

[bjohnso5]

@quartzmo do I need to update the go.mod in the showcase to point at the 0.218.0 release of google.golang.org/api?

Edited to add: based on the failure in the integration tests output, I think the answer is yes, so I've pushed a change to include that chore.

[codyoss]

Looks like we need to add a new leakchecker skip. maybe transport/controlbuf.go. The file that holds the items to ignore is leakcheck.go. Other than that this looks good to me. This is likely do to the new version on grpc

[codyoss]

@bjohnso5 Thank you for all your work on these contributions! We will get our generator updated. I expect the new code won't land until early next week though just FYI.