Change FactoryGirl to FactoryBot

[djberg96]

This PR is a followup to ManageIQ/manageiq#18279 where we're updating FactoryGirl to FactoryBot.

[miq-bot]

Checked commit https://github.com/djberg96/manageiq-consumption/commit/2228a39dd7e7913347058e6cd2ccd06148115416 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
20 files checked, 5 offenses detected

spec/models/data_rollup_spec.rb

• ❗ - Line 266, Col 126 - Style/DateTime - Prefer Date or Time over DateTime.
• ❗ - Line 266, Col 66 - Style/DateTime - Prefer Date or Time over DateTime.

spec/models/manager_spec.rb

• ❗ - Line 62, Col 117 - Style/DateTime - Prefer Date or Time over DateTime.
• ❗ - Line 62, Col 67 - Style/DateTime - Prefer Date or Time over DateTime.

spec/spec_helper.rb

• ❗ - Line 6, Col 94 - Layout/TrailingBlankLines - Final newline missing.