PY-79967 Introduce a separate method in PyStringLiteralUtil for t-strings

(cherry picked from commit 47b1a84c4331aa127a17e4f934c4b1dc28396cf0)

GitOrigin-RevId: 204f5ba41aa022b672e2d71db83b5bd3327770d4

python/python-psi-impl/src/com/jetbrains/python/psi/PyUtil.java

@@ -1747,6 +1747,13 @@ public final class PyUtil {
       return PyStringLiteralUtil.isFormattedPrefix(myPrefix);
     }
 
+    /**
+     * @return true if given string node contains "t" or "T" prefix
+     */
+    public boolean isTemplate() {
+      return PyStringLiteralUtil.isTemplatePrefix(myPrefix);
+    }
+
     /**
      * @return true if other string node has the same decorations, i.e. quotes and prefix
      */