refactor extra code, duplicates, complexity

- refactor array equality check and add tests
- remove OperatingSystem.Unknown causing extra logic, return undefined instead
- refactor enum validation to share same logic
- refactor scripting language factories to share same logic
- refactor too many args in runCodeAsync
- refactor ScriptCode constructor to reduce complexity
- fix writing useless write to member object since another property write always override it

tests/unit/application/Environment/DesktopOsTestCases.ts

@@ -9,7 +9,7 @@ interface IDesktopTestCase {
 export const DesktopOsTestCases: ReadonlyArray<IDesktopTestCase> = [
     {
         processPlatform: 'aix',
-        expectedOs: OperatingSystem.Unknown,
+        expectedOs: undefined,
     },
     {
         processPlatform: 'darwin',
@@ -17,7 +17,7 @@ export const DesktopOsTestCases: ReadonlyArray<IDesktopTestCase> = [
     },
     {
         processPlatform: 'freebsd',
-        expectedOs: OperatingSystem.Unknown,
+        expectedOs: undefined,
     },
     {
         processPlatform: 'linux',
@@ -25,11 +25,11 @@ export const DesktopOsTestCases: ReadonlyArray<IDesktopTestCase> = [
     },
     {
         processPlatform: 'openbsd',
-        expectedOs: OperatingSystem.Unknown,
+        expectedOs: undefined,
     },
     {
         processPlatform: 'sunos',
-        expectedOs: OperatingSystem.Unknown,
+        expectedOs: undefined,
     },
     {
         processPlatform: 'win32',