Try to make CI more robust with more retries (#11532)

* Try to make CI more robust with more retries

Try adding `--retry` to a bunch of `curl` commands to see if we can make
CI a bit more robust in

Try to make CI more robust with more retries (#11532)

* Try to make CI more robust with more retries

Try adding `--retry` to a bunch of `curl` commands to see if we can make
CI a bit more robust in the face of flaky network failures.

prtest:full

* See if rustls is less flaky

* See if curl isn't flaky?

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