Dont swallow errors when bad alias_method
Added additional help messaging when there's scaffolding being generated and a migration already exists for the resource.

The user is now alerted that they are able to skip the conflicted migration file via the --skip option.
Update outdated test.

The current test is asserting against an outdated version of
Request#method where HEAD requests are treated as GET requests.
Update test to clearly reflect what it is testing for.
Fix duplicated test.

There is already another test covering Request#request_method. This
test should cover Request#method.
Remove redundant test.

Since we're stubbing the request, the test is actually just asserting
that `@method = env['REQUEST_METHOD']`. In order to the test against
the methodoverride middleware, we should test it against an actual
request. However, Rack is already covering this scenario so we can
remove this test.
Follow-up to #16097 [ci skip]

Even if this is not exactly the same, let's add a new-line character
instead of two spaces. While it's specified in the Markdown specs that
adding spaces at the end of the line creates a break-line tag, this is
a brittle approach as people may remove them saving the file on certain
editors.
Merge pull request #15762 from arthurnn/better_error_on_bad_alias_method

Dont swallow errors when bad alias_method
Modified migration conflict message to remove the string concatenation.
LOCALHOST definition should match any 127.0.0.0/8 address

The entire 127.0.0.0/8 range is assigned to the loopback address, not
only 127.0.0.0/24. This patch allows ActionDispatch::Request::LOCALHOST
to match any IPv4 127.0.0.0/8 loopback address.

The only place that the #local? method was previously under test was
in the show_expectations_test.rb file. I don't particularly like that
that's implicitly where this code is under test, and I feel like I
should move some of that testing code into the
test/dispatch/request_test.rb file, but I wanted some feedback first.

Credit goes to @sriedel for discovering the issue and adding the
patch.
Add CHANGELOG for #14886

Also cleanup test a bit

[related #14886]
[related #14743]
Merge pull request #16221 from arthurnn/14886_pr

Cleanup + CHANGELOG for pr #14886
Merge pull request #16212 from aantix/additional_migration_conflict_help_messaging

Additional help messaging to help the user resolve a conflicted migration
Merge pull request #16098 from tgxworld/fixes_to_request_test

Fixes to request method test.