[CodeQuality] Skip same boolean in both branches in SimplifyIfReturnBoolRector

[TomasVotruba]

Fixes rectorphp/rector#9798

When both the if branch and the trailing statement return the same boolean, the condition does not affect the result, yet SimplifyIfReturnBoolRector rewrote it using the condition — producing a wrong result and dropping the condition's side effect.

Before (buggy output)

function test(): bool
{
    if (! return_false()) {
        return true;
    }

    return true;
}

was rewritten to:

function test(): bool
{
    return return_false(); // wrong — original always returns true
}

After

Left unchanged — both branches return the same boolean, so the rule now bails out.

Fix

shouldSkipIfAndReturn() now skips when the inner return and the trailing return are the same boolean value.