Migrate to Rails 7.1's file_fixture_upload naming approach

[agrobbin]

rails/rails#48857 renamed fixture_file_upload to file_fixture_upload to reduce "confusion and surprise". With this change, file_fixture_upload now works in RSpec, with fixture_file_upload still functional to maintain backwards compatibility.

[agrobbin]

I'm surprised by the test failures here, and am curious if they are due to something recent in another rspec gem (tests haven't been run on main in ~2 weeks). If there is something I've screwed up that's causing these failures, please let me know and I'll look into it!

[JonRowe]

This is actually due to the ameter gem adding a deprecation warning to a matcher we apparently used in our generator specs it looks like its an RSpec problem but its just we check our builds for warnings and so the error is hidden slightly, working on a fix in #2719 and then this can be rebased :)

[agrobbin]

@JonRowe thanks for the quick fix there! I've rebased this and gotten tests passing. It took an extra pass to add the appropriate testing for Rails 7.1+ and < 7.1, but I think things are in good shape now. Let me know if there's anything else I should change.

[agrobbin]

One minor note... I have included the delegation for file_fixture_upload in all Rails versions, even though it's only available in Rails 7.1.+. It should raise a NoMethodError if called in Rails < 7.1.

[JonRowe]

I'm confused as to what provides the old behaviour with this change, I can see the build passing but I don't understand what now provides fixture_file_upload

[agrobbin]

@JonRowe it's hard to see, since file_fixture_upload and fixture_file_upload look so similar, but fixture_file_upload is on this same delegate line, after file_fixture_upload.

[JonRowe]

Ah I see, sorry!

[agrobbin]

No problem!

[JonRowe]

Overall this looks fine, but I'm nervous of the support differences for 6.1 and 7.x, especially the change in module. Could I be a pain and ask you split this into two, with the old module for the old behaviour and the new module, and conditionally include the right module? If you don't want to I'm happy to finish this off

[agrobbin]

Happy to, @JonRowe! I should be able to do that tonight.

[agrobbin]

@JonRowe when I started looking at this, I actually noticed that FixtureFileUploadSupport already includes some conditional logic for Rails 7.1+ compared other versions:

rspec-rails/lib/rspec/rails/fixture_file_upload_support.rb

Lines 31 to 35 in cbc6fcc

	if ::Rails::VERSION::STRING < "7.1.0"
	attr_accessor :fixture_path
	else
	attr_accessor :fixture_paths
	end

With that in mind, I made a change that is more explicit about which methods are supported, but I left it in the same module. I'm curious if you think that's reasonable, or if you'd still prefer to break things apart.