Configurable pipeline upload retry attempts

[davidhao3300]

Is your feature request related to a problem? Please describe.

When running buildkite-agent pipeline upload, the CLI will attempt a hard-coded 60 attempts over 5 minutes to upload the pipeline. We personally would like to fail faster than that, but there is currently no way to configure this.

The upload code in question

The hard-coded constants

Describe the solution you'd like

Some way of configuring the retry parameters, probably via flags

Describe alternatives you've considered

N/A

Additional context

N/A