feat(agent): add CRD option to disable hostname verification

[ebaron]

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Fixes: #971

Description of the change:

• Adds a CRD option to disable hostname verification for Cryostat when connecting to agents' callback server

Motivation for the change:

• This provides a fallback for users if the automatic hostname detection fails for the Cryostat agent in their cluster. This can happen because cluster networking is very configurable.

How to manually test:

1. Deploy this PR
2. Create a CR with spec.agentOptions.disableHostnameVerification set to true
3. make sample_app_agent_injected
4. Sample app should register properly using its IP address for the callback URL

[ebaron]

/build_test

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