Replace "sleep" sample throughout Istio docs

[craigbox]

Having introduced a sample service named curl in istio/istio#53381, this PR attempts a giant replacement of sleep throughout the Istio docs.

[craigbox]

https://storage.googleapis.com/istio-prow/pr-logs/pull/istio_istio.io/15767/doc.test.dualstack_istio.io/1843579875621867520/artifacts/tests-setup-dualstack-a9b80b2bb/TestDocs/setup/additional-setup/dual-stack/test.sh/test.sh/_test_context/test.sh_output.txt

error: the path "samples/curl/curl.yaml" does not exist

(This PR needs to wait until the automator has caught up, which I think @bleggett is working on.)

[bleggett]

https://storage.googleapis.com/istio-prow/pr-logs/pull/istio_istio.io/15767/doc.test.dualstack_istio.io/1843579875621867520/artifacts/tests-setup-dualstack-a9b80b2bb/TestDocs/setup/additional-setup/dual-stack/test.sh/test.sh/_test_context/test.sh_output.txt

error: the path "samples/curl/curl.yaml" does not exist

(This PR needs to wait until the automator has caught up, which I think @bleggett is working on.)

Manual rebase of the automator PR from ~3 days ago here: #15768, once that's merged you should be mostly up to date.

[craigbox]

@dhawton tests pass - hopefully the commits I have somehow picked during rebase are appropriate!

[craigbox]

Sort order bug:

VERIFY FAILED snip_deploy_a_sample_application_3 (timeout after 120s):
received:
"NAME                            READY   STATUS    RESTARTS   AGE
curl-6f9bc47956-5w47h           2/2     Running   0          2m1s
helloworld-v1-bfb69958d-mvwxd   2/2     Running   0          2m1s"
expected:
"NAME                             READY   STATUS    RESTARTS   AGE
helloworld-v1-776f57d5f6-s7zfc   2/2     Running   0          10s
curl-64d7d56698-wqjnm            2/2     Running   0          9s"

[craigbox]

#15505 flaaaaaake

/test doc.test.profile-default

[craigbox]

/test doc.test.profile-default

[craigbox]

#15505 flaaaaaake

/test doc.test.profile-default

[craigbox]

#15505 flaaaaaake

/test doc.test.profile-default

[craigbox]

#15505 🤬

/test doc.test.profile-default