chore: fix problem with single tab run mode introduced by #27786 (#28032

)

* chore: fix problem introduced by <pr>

* Update packages/server/lib/modes/run.ts

packages/server/lib/modes/run.ts

@@ -545,10 +545,10 @@ function waitForSocketConnection (project: Project, id: string) {
   })
 }
 
-async function waitForTestsToFinishRunning (options: { project: Project, screenshots: ScreenshotMetadata[], videoCompression: number | boolean, exit: boolean, spec: SpecWithRelativeRoot, estimated: number, quiet: boolean, config: Cfg, shouldKeepTabOpen: boolean, testingType: TestingType, videoRecording?: VideoRecording, protocolManager?: ProtocolManager }) {
+async function waitForTestsToFinishRunning (options: { project: Project, screenshots: ScreenshotMetadata[], videoCompression: number | boolean, exit: boolean, spec: SpecWithRelativeRoot, estimated: number, quiet: boolean, config: Cfg, shouldKeepTabOpen: boolean, isLastSpec: boolean, testingType: TestingType, videoRecording?: VideoRecording, protocolManager?: ProtocolManager }) {
   if (globalThis.CY_TEST_MOCK?.waitForTestsToFinishRunning) return Promise.resolve(globalThis.CY_TEST_MOCK.waitForTestsToFinishRunning)
 
-  const { project, screenshots, videoRecording, videoCompression, exit, spec, estimated, quiet, config, shouldKeepTabOpen, testingType, protocolManager } = options
+  const { project, screenshots, videoRecording, videoCompression, exit, spec, estimated, quiet, config, shouldKeepTabOpen, isLastSpec, testingType, protocolManager } = options
 
   const results = await listenForProjectEnd(project, exit)
 
@@ -644,12 +644,12 @@ async function waitForTestsToFinishRunning (options: { project: Project, screens
   // @ts-expect-error experimentalSingleTabRunMode only exists on the CT-specific config type
   const usingExperimentalSingleTabMode = testingType === 'component' && config.experimentalSingleTabRunMode
 
-  if (usingExperimentalSingleTabMode) {
+  if (usingExperimentalSingleTabMode && !isLastSpec) {
     await project.server.destroyAut()
   }
 
-  // we do not support experimentalSingleTabRunMode for e2e
-  if (!usingExperimentalSingleTabMode) {
+  // we do not support experimentalSingleTabRunMode for e2e. We always want to close the tab on the last spec to ensure that things get cleaned up properly at the end of the run
+  if (!usingExperimentalSingleTabMode || isLastSpec) {
     debug('attempting to close the browser tab')
 
     await openProject.resetBrowserTabsForNextTest(shouldKeepTabOpen)
@@ -920,6 +920,7 @@ async function runSpec (config, spec: SpecWithRelativeRoot, options: { project:
       videoCompression: options.videoCompression,
       quiet: options.quiet,
       shouldKeepTabOpen: !isLastSpec,
+      isLastSpec,
       protocolManager: options.protocolManager,
     }),
     waitForBrowserToConnect({