[ruby-core:115003] [Ruby master Bug#19919] Variable assignments in condition are warned however class variable assignment and constant declaration are not warned

Issue #19919 has been reported by yui-knk (Kaneko Yuichiro).

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Bug #19919: Variable assignments in condition are warned however class variable assignment and constant declaration are not warned
https://bugs.ruby-lang.org/issues/19919

* Author: yui-knk (Kaneko Yuichiro)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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Is it better to warn for class variable assignment and constant declaration in condition?

```ruby
(x, y = 1, 2) ? x : y # test.rb:1: warning: found `= literal' in conditional, should be ==

if a = 1 # test.rb:3: warning: found `= literal' in conditional, should be ==
end

b = 1
1.times do
  if b = 2 # test.rb:8: warning: found `= literal' in conditional, should be ==
  end
end

if $a = 1 # test.rb:12: warning: found `= literal' in conditional, should be ==
end

if @a = 1 # test.rb:15: warning: found `= literal' in conditional, should be ==
end

class A
  if @@a = 1 # no warning
  end
end

if B = 1 # no warning
end
```

I use `ruby 3.3.0preview2 (2023-09-14 master e50fcca9a7)`.



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