Only quote php --ini values when out is a tty

A comment in php#18527 mentioned that many scripts use `php—-ini` to bootstrap information about the system. Searching on GitHub confirms that many places will not work with quotes out of the box: https://github.com/search?q=content%3A%22php%20--ini%22&type=code.

Many seem to be variants on this pattern

```
$ echo "extension=mongodb.so" >> `php --ini | grep "Loaded Configuration" | sed -e "s|.*:\s*||"`
```

To preserve these existing scripts, we can detect when the output is a TTY to optionally quote them. This is the new behavior:

Output is a tty:

```
$ make -j$(nproc) &> /dev/null && env PHP_INI_SCAN_DIR="/opt/homebrew/etc/php/8.4/conf.d         " PHPRC="/opt/homebrew/etc/php/8.4" ./sapi/cli/php --ini
Configuration File (php.ini) Path: "/usr/local/lib"
Loaded Configuration File:         "/opt/homebrew/etc/php/8.4/php.ini"
Scan for additional .ini files in: "/opt/homebrew/etc/php/8.4/conf.d         "
Additional .ini files parsed:      (none)
```

Output is not a tty:

```
$ make -j$(nproc) &> /dev/null && env PHP_INI_SCAN_DIR="/opt/homebrew/etc/php/8.4/conf.d         " PHPRC="/opt/homebrew/etc/php/8.4" ./sapi/cli/php --ini | tee
Configuration File (php.ini) Path: /usr/local/lib
Loaded Configuration File:         /opt/homebrew/etc/php/8.4/php.ini
Scan for additional .ini files in: /opt/homebrew/etc/php/8.4/conf.d
Additional .ini files parsed:      (none)
```

Author: schneems

NEWS

@@ -14,7 +14,7 @@ PHP                                                                        NEWS
   . Drop support for -z CLI/CGI flag. (nielsdos)
   . Fixed GH-17956 - development server 404 page does not adapt to mobiles.
     (pascalchevrel)
-  . Changed - `php --ini` now quotes some values with double quotes, to
+  . Changed `php --ini` to quotes some values with double quotes, to
     help humans debug unexpected whitespace, when stdout is a tty.
     (schneems)