Add talos support for os-release files

[clamoriniere]

What this PR does / why we need it:

Based on #1572,

• Added the configuration value datadog.disablePasswdMount to disable mounting the /etc/passwd path from the host filesystem. This option should be used when the underlying OS does not have these files (e.g., Talos OS).
• Added the configuration value datadog.disableDefaultOsReleasePaths to disable mounting the default "os-release" file paths from the host filesystem (e.g., /etc/redhat-release, /etc/fedora-release, etc.). Note that this change does not affect the datadog.osReleasePath option. To avoid mounting the /etc/os-release host path, set the datadog.osReleasePath configuration value to an empty string. This option should be used when the underlying OS does not have these files (e.g., Talos OS).
• Add providers.talos.enabled to simplify agent deployment configuration on Talos OS.
• Let the end user know when an incompatible options is set with datadog.disableDefaultOsReleasePaths set to true.

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:

tested locally in a kind cluster with different setup

• check that with providers.talos.enabled:true the /etc/passwd host file is not mounted

datadog:
  apiKeyExistingSecret: datadog-secret-api
  appKeyExistingSecret: datadog-secret-app
  kubelet:
    tlsVerify: false

providers:
  talos:
    enabled: true

• check that /etc/os-release is not mounted if datadog.osReleasePath is set to an empty string

datadog:
  apiKeyExistingSecret: datadog-secret-api
  appKeyExistingSecret: datadog-secret-app
  kubelet:
    tlsVerify: false

  osReleasePath: ""  # check if removing the default value make the volume to not be mounted

providers:
  talos:
    enabled: true

• check that talos provider option is compatible with datadog.sbom.host.enabled:true

datadog:
  apiKeyExistingSecret: datadog-secret-api
  appKeyExistingSecret: datadog-secret-app
  kubelet:
    tlsVerify: false

  sbom:
    host:
      enabled: true

providers:
  talos:
    enabled: true

Checklist

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

• Chart Version bumped
• Documentation has been updated with helm-docs (run: .github/helm-docs.sh)
• CHANGELOG.md has been updated
• Variables are documented in the README.md
• For Datadog Operator chart or value changes update the test baselines (run: make update-test-baselines)