Add support for inter agent communication using vsock

[lebauce]

What this PR does / why we need it:

Kata containers makes use of microVM to run pods. In these environments, network may not be available at all. vsock allows communication between the host and the guest through the hypervisor, without using TCP sockets.

DataDog/datadog-agent#39478 added support for vsock sockets in the agent.

This PR modifies the Helm Charts by:

• setting the right configs (DD_VSOCK_ADDR, ...) to enable the feature
• set the /etc/datadog-agent/auth as a hostpath so that it can be shared with the microVM through virtiofs

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• Chart Version semver bump label added (use <chartName>/minor-version, <chartName>/patch-version, or <chartName>/no-version-bump)
• For datadog or datadog-operator chart or value changes, update the test baselines (run: make update-test-baselines)

GitHub CI takes care of the below, but are still required:

• Documentation has been updated with helm-docs (run: .github/helm-docs.sh)
• CHANGELOG.md has been updated
• Variables are documented in the README.md