refactor the naming within plugin new generator

Having a method called `full?`, which checks on :full and :mountable
is very confusing. I renamed `full?` to `engine?` and created a `full?`
method that only checks the `:full` option
Fix indent in UnknownAction template
small fix in js guide [ci skip]
remove unnecessary always-nil var from #compact
Merge pull request #8675 from goshakkk/cleanup

Remove unnecessary always-nil var from #compact
Add -B alias for --skip-bundle
Merge pull request #8676 from mekishizufu/skip_bundle_alias

Add -B alias for --skip-bundle
fix alignment in rails info properties page [ci skip]
update rake tasks output [ci skip]
Add CHANGELOG entry for changes in exception pages
Add entry in Releases Notes about changes in exceptions page
unused scope
Merge pull request #8677 from amatsuda/unused_scope_in_test_models

unused scope in AR test model
Address a failure test_remove_column_with_multi_column_index with Oracle database

Not only PostgreSQL, Oracle database adapter drops the multi-column index
if any of the indexed columns dropped by remove_column.
Merge pull request #8678 from yahonda/remove_column_oracle

Address a failure test_remove_column_with_multi_column_index with Oracle
Standardize the use of current_adapter?
remove meaningless AS::FrozenObjectError
Merge pull request #8682 from amatsuda/rm_as_frozen_object_error

remove meaningless AS::FrozenObjectError
Add missing changelog entry for #8676 [ci skip]
Merge pull request #8686 from mekishizufu/changelog_entry

Add missing changelog entry for #8676 [ci skip]