javascript: Add support for document.defaultView in global variable references

Updated the data flow analysis to include `document.defaultView` as a source node for global variable references. Added a new test file `tst4.js` and updated existing tests to verify the inclusion of `defaultView` and its properties in the expected results.

Author: Eliav2

.gitignore

@@ -10,6 +10,7 @@
 *.actual
 */ql/test*/**/*.testproj
 */ql/test/**/go.sum
+*.testproj
 
 # Visual studio temporaries, except a file used by QL4VS
 .vs/*