Add app.rb and helpers.rb back for backward compatibility

[st0012]

Motivation / Background

Those files were removed in #51760, but gems like console1984 depend on these files for legacy Rails console command extensions. So keeping files around is required for backward-compatibility.

Detail

The files were added back and just require rails/console/methods.rb instead with messages like:

DEPRECATION WARNING: `rails/console/app.rb` has been deprecated and will be removed in Rails 8.0.
Please require `rails/console/methods.rb` instead.
 (called from <main> at /path_to_rails/railties/lib/rails/console/app.rb:3)

DEPRECATION WARNING: `rails/console/helpers.rb` has been deprecated and will be removed in Rails 8.0.
Please require `rails/console/methods.rb` instead.
 (called from <main> at /path_to_rails/railties/lib/rails/console/helpers.rb:3)

Additional information

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Unrelated changes should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug or add a feature.
• CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature. Minor bug fixes and documentation changes should not be included.

[carlosantoniodasilva]

I think we need to point this to 7-2-stable now that it's been created, so we keep the files there (where console methods are deprecated) but remove from main (where that's likely to be removed anyway)... wdyt?

[st0012]

@carlosantoniodasilva 👍 updated

[skipkayhil]

Should we also add a deprecation warning here so there's a notice before removal in 8.0?

[carlosantoniodasilva]

Yes, let's add a deprecation to the individual files as well, otherwise someone importing it might not realize the files themselves are also going away.

[st0012]

I actually committed it last week but somehow lost it when switching branches 😅
All updated now. PR description has an example message.

[ghiculescu]

I think we need to point this to 7-2-stable now that it's been created, so we keep the files there (where console methods are deprecated) but remove from main (where that's likely to be removed anyway)... wdyt?

Please merge it on main too 🙏 The issue currently occurs when running Edge Rails. So if this is not fixed on main, then when the next Rails release goes out, it will still be a breaking change for downstream gems.

[rafaelfranca]

Let's deprecate and merge on main as well. We will remove the deprecation later.