Fixing missing TLS settings. While developing the pre-check probes, I forgot to add the certificate settings, which are essential for establishing a connection to origintunneld. I discovered this while testing cloudflared locally.
This introduces the main precheck logic. This will follow concurrency model, timeout handling, and retry logic established in the SPEC. We will follow the decision flow in the [connectivity pre-checks SPEC](https://wiki.cfdata.org/spaces/TUN/pages/1374967685/Connectivity+Pre-checks+for+cloudflared). You can find an attached image of what the decision flow should look like.
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