LOPS-2119 - Wait for a healthcheck before releasing the command

[stovak]

Tested with a local build against production PAPI. Seems to satisfy done-whens.

[stovak]

stovak@T2GJHGYXTH-stovak terminus % ./terminus.phar site:create tom-new-site tom-new-site wordpress && curl -I https://dev-tom-new-site.pantheonsite.io 
 [notice] Creating a new site...
 [notice] Deploying CMS...
 [notice] Waiting for site availability...
 [notice] Your site has been created successfully!
HTTP/2 302 
cache-control: no-cache, must-revalidate, max-age=0
content-type: text/html; charset=UTF-8
expires: Wed, 11 Jan 1984 05:00:00 GMT
location: https://dev-tom-new-site.pantheonsite.io/wp-admin/install.php
server: nginx
strict-transport-security: max-age=300
x-pantheon-styx-hostname: styx-fe3-a-9764b5db6-5xxcp
x-redirect-by: WordPress
x-styx-req-id: 7d2cd649-f21b-11ee-83f7-c66ab8a72908
date: Thu, 04 Apr 2024 00:37:17 GMT
x-served-by: cache-chi-klot8100078-CHI, cache-bur-kbur8200128-BUR
x-cache: MISS, MISS
x-cache-hits: 0, 0
x-timer: S1712191037.199001,VS0,VE276
vary: Cookie, Cookie
x-robots-tag: noindex
age: 0
accept-ranges: bytes
via: 1.1 varnish, 1.1 varnish
content-length: 0

[rwagner00]

LGTM

[greg-1-anderson]

Here we go again, more comments that I should have made the first time.

1. Could we reduce the wait to 1s?
2. Could we avoid sleeping altogether unless "wake" fails?

(Re implementation note for 2, I'd recommend moving the "while" conditional to the top of the loop, and put in a duplicate call to "wake" on the line before.)