fix: reset root workspace project on restart (#7238)

Author: sheremet-va

packages/vitest/src/node/core.ts

@@ -203,6 +203,7 @@ export class Vitest {
     this._workspaceConfigPath = undefined
     this.coverageProvider = undefined
     this.runningPromise = undefined
+    this.coreWorkspaceProject = undefined
     this.specifications.clearCache()
     this._onUserTestsRerun = []
 

packages/vitest/src/node/project.ts

@@ -491,10 +491,8 @@ export class TestProject {
     return testFiles
   }
 
-  /** @internal */
-  _parentBrowser?: ParentProjectBrowser
-  /** @internal */
-  _parent?: TestProject
+  private _parentBrowser?: ParentProjectBrowser
+  private _parent?: TestProject
   /** @internal */
   _initParentBrowser = deduped(async () => {
     if (!this.isBrowserEnabled() || this._parentBrowser) {