Replace injected Ansible fact variables in bootstrap_os role

[NikKumar811]

What type of PR is this?

/kind cleanup

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

This PR updates the bootstrap_os role to replace usage of injected Ansible fact variables (ansible_*) with ansible_facts[...]. This ensures compatibility with upcoming Ansible 2.24 changes, where fact injection will be disabled by default.

Which issue(s) this PR fixes:

Related to #13208

Special notes for your reviewer:

• Changes are limited to the bootstrap_os role for focused review
• No changes were made to hostvars, ansible_env, or set_fact usage
• Existing logic and behavior are preserved
• Roles reviewed with no required changes:
  - adduser
  - bastion-ssh-config
  - bootstrap-os

Does this PR introduce a user-facing change?:

None

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: NikKumar811
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[k8s-ci-robot]

Hi @NikKumar811. Thanks for your PR.

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