Remove /debug/jobs/list?v=1 endpoint

Overview

When the listen address is configured we expose an endpoint host:post/debug/jobs/list which by default outputs the logs below (v1), but if you pass in the query parameter ?v=2 so like host:post/debug/jobs/list?v=2 it would out more detailed values. The reason we had v=2 is in case someone depended on the data of v1 and we didn't want to cause a breaking change.

v1

id=405521380 url=https://gitlab.com/gitlab-org/gitlab.git state=running stage=build_script executor_stage=docker_run
id=405521386 url=https://gitlab.com/gitlab-org/gitlab.git state=running stage=build_script executor_stage=docker_run

v2

url=https://gitlab.com/gitlab-org/gitlab/-/jobs/405521380 state=running stage=build_script executor_stage=docker_run duration=1h23m5.876837725s
url=https://gitlab.com/gitlab-org/gitlab/-/jobs/405521386 state=running stage=build_script executor_stage=docker_run duration=1h23m5.391078748s

Proposal

Remove the v1 output and make v2 output the default to have less code. The impact of this should be low since not a lot of users depend on it and this endpoint is used for monitoring so if it "breaks" something it will break monitoring not running any job.