Deprecate ${} string interpolation

https://wiki.php.net/rfc/deprecate_dollar_brace_string_interpolation

Fix GH-8140: Wrong first class callable by name optimization

When optimizing by name function calls, we must not replace
`CALLABLE_CONVERT` opcodes, but have to keep them.

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Fix GH-8140: Wrong first class callable by name optimization

When optimizing by name function calls, we must not replace
`CALLABLE_CONVERT` opcodes, but have to keep them.

Closes GH-8144.

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