[Config] Add option to skip server cert verification

[nerophon]

Is your feature request related to a problem?

Enterprise users need to be able to deploy quickly in pre-secured environments, both for testing and simplification of deployments across vast estates. For this reason, it's important that our agents support the capability to skip server cert verification when desired, just as our classic agents do.

Describe the solution you'd like

A simple config option passed in as part of the launch string is what we had in mind.

Describe alternatives you've considered

This is a time-saving measure, making deployment at scale easier and more efficient. The alternative is to turn off TLS including at the server side. But this is unfeasible in enterprises, it violates policy and could never be done across a large estate of hosts.

Additional ideas

We could probably contribute this change upstream as well.

[jackshirazi]

Discussed at the OTEL SIG, we will offer a PR for the SDK to support this

[jackshirazi]

for ref, the classic agent option is https://www.elastic.co/guide/en/apm/agent/java/current/config-reporter.html#config-verify-server-cert

[SylvainJuge]

Also, the PHP have support for it as visible in the migration docs with the ELASTIC_OTEL_VERIFY_SERVER_CERT configuration option.