[CI] Add workflow_dispatch.inputs to control dashboard runs (#101279)
Summary: This gives a finer control for developers to specify which set
of configs to measure for their one-off dashboard run. Right now the
queuing for those runs look pretty bad.
Another change here is reducing the inference measurement frequency to
2 times a week.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/101279
Approved by: https://github.com/huydhn
