Chore: remove currentScopes property from Linter instances (refs #9161)…

… (#9187)

The `currentScopes` property is undocumented, and is redundant with the `scopeManager` property. This commit removes it.

lib/linter.js

@@ -747,7 +747,6 @@ class Linter {
     constructor() {
         this.messages = [];
         this.currentConfig = null;
-        this.currentScopes = null;
         this.scopeManager = null;
         this.currentFilename = null;
         this.traverser = null;
@@ -766,7 +765,6 @@ class Linter {
     reset() {
         this.messages = [];
         this.currentConfig = null;
-        this.currentScopes = null;
         this.scopeManager = null;
         this.traverser = null;
         this.reportingConfig = [];
@@ -969,10 +967,8 @@ class Linter {
             fallback: Traverser.getKeys
         });
 
-        this.currentScopes = this.scopeManager.scopes;
-
         // augment global scope with declared global variables
-        addDeclaredGlobals(this.sourceCode.ast, this.currentScopes[0], this.currentConfig, this.environments);
+        addDeclaredGlobals(this.sourceCode.ast, this.scopeManager.scopes[0], this.currentConfig, this.environments);
 
         const eventGenerator = new CodePathAnalyzer(new NodeEventGenerator(emitter));
 
@@ -1063,7 +1059,7 @@ class Linter {
 
         }
 
-        return this.currentScopes[0];
+        return this.scopeManager.scopes[0];
     }
 
     /**