Cleanup client GC endpoints to avoid using the GET method

[langmartin]

See #5970, where we avoid an EOF error on an empty GET response body. This prevents the error on the GC endpoints, but those endpoints should use an explicitly side-effecting method for clarity.

[langmartin]

The original issue fixed by #5970 is #5994

[stale]

Hey there

Since this issue hasn't had any activity in a while - we're going to automatically close it in 30 days. If you're still seeing this issue with the latest version of Nomad, please respond here and we'll keep this open and take another look at this.

Thanks!

[stale]

Hey there

Since this issue hasn't had any activity in a while - we're going to automatically close it in 30 days. If you're still seeing this issue with the latest version of Nomad, please respond here and we'll keep this open and take another look at this.

Thanks!