Add support of vsock for intra agents communications

[lebauce]

What does this PR do?

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

Motivation

Some environments do not allow workload to have network interfaces. Using vsock sockets
allow these workloads to communicate with the agent.

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: v7.74.0
• Cluster Agent: v7.74.0

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

❌ Patch coverage is 18.75000% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.47%. Comparing base (71bf50d) to head (374e702).
⚠️ Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/controller/datadogagent/common/volumes.go	0.00%	9 Missing ⚠️
...controller/datadogagent/component/agent/default.go	25.00%	8 Missing and 1 partial ⚠️
...nal/controller/datadogagent/feature/cws/feature.go	30.76%	7 Missing and 2 partials ⚠️
internal/controller/datadogagent/global/global.go	0.00%	8 Missing and 1 partial ⚠️
...datadogagentinternal/controller_reconcile_agent.go	0.00%	2 Missing ⚠️
...troller/datadogagent/controller_reconcile_agent.go	50.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (18.75%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2336      +/-   ##
==========================================
+ Coverage   36.92%   37.47%   +0.54%     
==========================================
  Files         273      281       +8     
  Lines       22926    25081    +2155     
==========================================
+ Hits         8466     9398     +932     
- Misses      13821    14975    +1154     
- Partials      639      708      +69     

Flag	Coverage Δ
unittests	37.47% <18.75%> (+0.54%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ler/datadogagent/component/clusteragent/default.go	98.67% <100.00%> (ø)
internal/controller/datadogagent/global/agent.go	83.72% <ø> (ø)
...troller/datadogagent/controller_reconcile_agent.go	62.41% <50.00%> (ø)
...datadogagentinternal/controller_reconcile_agent.go	4.50% <0.00%> (ø)
internal/controller/datadogagent/common/volumes.go	0.00% <0.00%> (ø)
...controller/datadogagent/component/agent/default.go	11.36% <25.00%> (+4.12%)	⬆️
...nal/controller/datadogagent/feature/cws/feature.go	77.86% <30.76%> (-0.56%)	⬇️
internal/controller/datadogagent/global/global.go	46.73% <0.00%> (-2.22%)	⬇️

... and 33 files with indirect coverage changes

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