This switches `run list` and `run view` commands to measure how long ago did the run happen by using `run_started_at`, which is the timestamp of the latest run in a series, instead of `created_at`, which is the timestamp of the first run. This change also fixes accurate duration for in-progress runs.
Add pager functionality to the following commands:
- gist list
- pr checks
- release list
- run list
- run view
- secret list
- workflow list
- workflow view
Additionally, normalize error handling when starting the pager has
failed: only print a non-fatal notice to stderr instead of aborting the
whole command.
