fix: allow disabling throttling in project monitors

[vigneshshanmugam]

• fix Disable throttling #689
• PR fixes the types and allows throttling to be disabled via
  • CLI - --no-throttling
  • Synthetics Config File - monitor.throttling: false
  • Monitor API - monitor.use({ throttling: false })
• Needs Kibana fix to work End to End - [Uptime] Allow project monitors to be configured with throttling disabled kibana#148344

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• Start Time: 2023-01-03T19:30:11.332+0000

• Duration: 15 min 9 sec

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[dominiqueclarke]

LGTM. Tested it alongside https://github.com/elastic/kibana/pull/148669](https://github.com/elastic/kibana/pull/148669)

[paulb-elastic]

@vigneshshanmugam with elastic/kibana#148344 not in 8.6, does it matter than this is merged and will be included in beta.40 which will be released before 8.7? (or does it just fail silently and not disable throttling with earlier versions of Kibana?)

[dominiqueclarke]

@paulb-elastic It won't fail silently, users will receive the following error in 8.6

   > Failed to save or update monitor. Configuration is not valid: monitor(test-example-journey)
       Invalid value "false" supplied to "throttling"

[paulb-elastic]

@dominiqueclarke ok, thanks. I see that the Kibana fix has been backported to 8.6.1, so will be included with that when it comes out. We'll just need to remember that this won't work until that's available.

Actually, we should get the docs updated to reflect this new option too, I've raised elastic/observability-docs#2503 to capture this for 8.6.1