refactor(ansible): rename some variables to conform new lint rules

[xmfcx]

Description

Related PR:

• ci(pre-commit-ansible): autoupdate #3512

Updating to ansible-lint version

• from rev: v6.16.1
• to rev: v6.22.0

caused following errors:

• https://github.com/autowarefoundation/autoware/actions/runs/6871052871/job/18687163006?pr=3512

var-naming[no-role-prefix]: Variables names from within roles should use role_name_ as a prefix. Underlines are accepted before the prefix.

More info can be found in: https://ansible.readthedocs.io/projects/lint/rules/var-naming/

This PR renames the variables and their usages in this repository to fix this.

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[xmfcx]

I will temporarily also bump up the version just to see if the new lint rules work.

[xmfcx]

With the updated version, it passes the linter: https://github.com/autowarefoundation/autoware/actions/runs/6874788397/job/18697109204?pr=3988#step:4:87

I will now revert the version bump, it will be merged in its own PR anyways.

[xmfcx]

It now passes ☺️ https://github.com/autowarefoundation/autoware/actions/runs/6890349139/job/18743202143?pr=3512