[NodeAnalyzer] Treat infinite loop without break as always terminated

[TomasVotruba]

Fixes rectorphp/rector#9852

TerminatedNodeAnalyzer::isAlwaysTerminated() did not recognize an infinite loop (while (true), do {} while (true), for (;;)) with no break as a terminating statement. Anything following such a loop is unreachable, but the analyzer reported the loop as fall-through.

Consequence downstream: ConsoleExecuteReturnIntRector appended a redundant return Command::SUCCESS; after a while (true) body whose exits all return, producing an unreachable statement that fails PHPStan at level 7+ (reported in the issue). RemoveUnreachableStatementRector (the core consumer) also failed to strip such dead code.

Now an infinite loop with no escaping break/goto is treated as always terminated:

protected function execute(...): int
{
    while (true) {
        if ($this->shouldStop()) {
            return Command::SUCCESS;
        }
        $this->tick();
    }
    // was appended before, now correctly omitted:
    // return Command::SUCCESS; ← unreachable
}

Behavior with RemoveUnreachableStatementRector:

 while (true) {
     if ($a) {
         return 'A';
     }
     $a = doSomething();
 }
-echo 'never executed';

Conservative on purpose: a loop containing any break/goto (which may exit it) is left as non-terminating, so no code that could still be reached is dropped. Only literal always-true conditions (true, non-zero int literal, empty for(;;)) qualify — dynamic conditions like while ($x) are untouched.

Fixtures: always_terminated_infinite_while.php.inc (removed dead code) and skip_while_true_with_break.php.inc (kept, has a break).