Updated OpFor Skill Generator and Added Skilled Level Parser

Replaced `StratConSkillGenerator` with `ModifiedConstantSkillGenerator` in `AtBDynamicScenarioFactory`. Introduced skill level adjustments based on dice rolls and added a new method in `SkillLevel` to parse integer values to skill levels.

megamek/src/megamek/common/enums/SkillLevel.java

@@ -18,14 +18,14 @@
  */
 package megamek.common.enums;
 
+import megamek.MegaMek;
+import megamek.logging.MMLogger;
+
 import java.util.List;
 import java.util.ResourceBundle;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import megamek.MegaMek;
-import megamek.logging.MMLogger;
-
 public enum SkillLevel {
     // region Enum Declarations
     NONE("SkillLevel.NONE.text", "SkillLevel.NONE.toolTipText"),
@@ -190,6 +190,29 @@ public static SkillLevel parseFromString(final String text) {
 
         return REGULAR;
     }
+
+    /**
+     * Parses an integer value to a {@link SkillLevel} enumeration.
+     *
+     * @param value the integer value to parse
+     * @return the {@link SkillLevel} enum corresponding to the given integer value
+     * @throws IllegalStateException if the integer value does not match any {@link SkillLevel} enum
+     * value
+     */
+    public static SkillLevel parseFromInteger(final int value) {
+        return switch (value) {
+            case 0 -> NONE;
+            case 1 -> ULTRA_GREEN;
+            case 2 -> GREEN;
+            case 3 -> REGULAR;
+            case 4 -> VETERAN;
+            case 5 -> ELITE;
+            case 6 -> HEROIC;
+            case 7 -> LEGENDARY;
+            default -> throw new IllegalStateException(
+                "Unexpected value in megamek/common/enums/SkillLevel.java: " + value);
+        };
+    }
     // endregion File I/O
 
     @Override