Fixes #26850 - set ansible_become_method per REX effective method

[snagoor]

Set ansible privilege escalation method ansible_become_method per REX remote_execution_effective_user_method setting.

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[ares]

[test foreman_ansible] should be fixed by #274

/usr/local/rvm/gems/ruby-2.6.3@foreman_ansible-pull-request-3/gems/factory_bot-5.0.2/lib/factory_bot/definition_proxy.rb:97:in `method_missing': undefined method 'template' in 'job_template' factory (NoMethodError)

[ares]

this now fails due to rubocop, we'll fix it elsewhere, tests were green

322 runs, 663 assertions, 0 failures, 0 errors, 0 skips
144 runs, 327 assertions, 0 failures, 0 errors, 0 skips

so we can proceed with the review

[ezr-ondrej]

LGTM 👍

[ares]

Failures are due to rubocop issue, merging. Thanks @snagoor and @ezr-ondrej