PR1: Move playbooks/ and common/ to src/, update all paths

[abhishek-sa1]

This PR moves all playbook directories into src/playbooks/ as the first step in the monorepo migration plan.

Changes:

• git mv 13 playbook directories to src/playbooks/:

  • prepare_oim
  • discovery
  • provision
  • input_validation
  • local_repo
  • build_image_x86_64
  • build_image_aarch64
  • telemetry
  • upgrade
  • rollback
  • gitlab
  • log_collector
  • utils

• Move common/ into src/common/

• Update root ansible.cfg: common/ -> src/common/

• Update 13 subsystem ansible.cfg: reduce ../ for common/

• Update credential_utility ansible.cfg: reduce ../ for common/

• Update all role_path and playbook_dir references in YAML files

• Update decrypt_include_encrypt.yml internal path

Path Updates:

• Updated 14 ansible.cfg files
• Updated all include_tasks/include_vars cross-references to common/
• roles_path in upgrade/rollback ansible.cfg unchanged (relative within playbooks/)
• import_playbook refs unchanged (relative between sibling playbook dirs)

Testing:

• ansible-playbook --syntax-check on all moved playbooks

Depends on: None
Part of: Monorepo Migration Plan - Phase 1