Add chart support for EKS Auto Mode (DO NOT MERGE)

[dloucasfx]

Description:
Note: This will fail tests until we consume the latest contrib

• Introduce new distribution eks/auto-mode and clusterReceiver.hostNetwork which is not set by default

• to reduce friction and keep it simple, the agreement is to run the cluster receiver in host network namespace, unless user explicitly specified not to. In this case a warning to will be added with a link to our docs on how to configure pod identity.
  Similar warning will be thrown if user is deploying a gateway

• ec2 detector was replaced with eks detector and the same attributes are enabled To keep the scope limited, this will be added in a different PR , once this PR is merged.

• Changed the health check default port for the daemonset to 13133 and the cluster receiver internal metrics server port to 8899 to avoid conflicts

• Added a new mount point for os-release

• Added a new example for eks auto mode

• Added root_path: "/hostfs" to sfx exporter [signalfxexporter] Fix invalid and missing host metadata open-telemetry/opentelemetry-collector-contrib#40218

• Update the reamde

Link to Splunk idea: <Link to Splunk idea, see https://ideas.splunk.com>

Testing:

Documentation:

[dloucasfx]

We can't merge or use this feature until the chart consumes 0.128.0 which will contain the eks detector changes.
Setting this as draft and for now, I will create smaller independent PRs for changes that do not require the latest upstream