Rename archive_on to archived_at for consistency

[agrare]

Other rails timestamp columns are e.g. created_at/updated_at, rename archived_on to archived_at for consistency.

[miq-bot]

Checked commit https://github.com/agrare/inventory_refresh/commit/96bce27b75e214a59acf0dcf510922fbe0eef88a with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0 13 files checked, 21 offenses detected

lib/inventory_refresh/save_collection/saver/retention_helper.rb

• [ ] :exclamation: - Line 65, Col 83 - Rails/SkipsModelValidations - Avoid using update_all because it skips validations.

spec/models/archived_mixin.rb

• [ ] :exclamation: - Line 28, Col 23 - Rails/SkipsModelValidations - Avoid using update_all because it skips validations.

spec/models/container_image.rb

• [ ] :exclamation: - Line 23, Col 23 - Rails/SkipsModelValidations - Avoid using update_all because it skips validations.

spec/schema.rb

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