[Universal Profiling Agent] Support with ECE whereby ECE proxies are issued by self-signed untrusted CA certificate

[documentation](https://www.elastic.co/docs/current/integrations/profiler_agent), Universal Profiling Agent is supported against Elastic Cloud which uses a certificate issued by a trusted certificate authority.

This currently does not include support where elasticsearch cluster is hosted in ECE. And when testing to work against an elasticsearch cluster that is behind a load balancer using certificate issued by a self-signed certificate authority. The error will include `Failed to setup gRPC connection (try 1 of 5): context deadline exceeded: connection error: desc = \”transport: authentication handshake failed: tls: failed to verify certificate: x509: certificate signed by unknown authority` which is fully expected as the certificate is not trusted by default

To add support it would require :
- Ability to provide CA certificate
- Ability to set verification mode
- Test if there may be other issues when elasticsearch cluster is not hosted cloud cluster