Fix Amazon Linux 2023 support and improve version pinning idempotency

[AlaiaNakama]

Description
This PR addresses several issues regarding Amazon Linux 2023 (AL2023) compatibility and fixes a bug where providing a version string to nrinfragent_state caused the yum/dnf modules to fail.

Key Changes

• AL2023 Support:

  • Skipped redhat-lsb-core installation on AL2023 (package unavailable).
  • Updated repository logic to correctly route AL2023 to the EL8 repository.
  • Set repo_gpgcheck: no specifically for AL2023 to bypass metadata signature requirements not supported by the current NR repo.

• Version Pinning & Idempotency:

  • Refactored Install agent yum to allow nrinfragent_state to accept version strings (e.g., 1.71.4-1.el8) by moving the version to the package name and forcing state: present.
  • Isolated python-yaml dependency states from the global agent version string to prevent "invalid state" errors on legacy systems.

• Dependency Management:

  • Updated python-pip package naming logic to support the python3-pip requirement on RHEL 8+ and AL2023.
  • Gated PyYAML installation via Pip to be non-blocking if Pip is unavailable.

Verification Results
Validated the following on clean AMI instances:

• Amazon Linux 2023: Successful install, version pinning to 1.71.4-1.el8, and verified log forwarding (fluent-bit) activity.
• RHEL 8: Successful install and verified python3-pip dependency resolution, and verified log forwarding (fluent-bit) activity.
• Amazon Linux 2: Confirmed no regressions; correctly routed to EL7 repo and handled python-yaml dependency.