pass startedAt onTestCaseResult

[RahulARanger]

Summary

This PR is to provide the started timestamp inside of the TestCaseResult object passed in custom reporter's onTestCaseResult

• Passed started timestamp in parseSingleTestResult
• Typings: Added started type in TestCaseResult Object

if we modify AssertionCountsReporter in e2e/customReporters

 onTestCaseResult(test, testCaseResult) {
    console.log(
      `onTestCaseResult: ${testCaseResult.title}, ` +
        `status: ${testCaseResult.status}, ` +
        `numExpectations: ${new Date(testCaseResult.startedAt)}`,
    );
  }

then notice we would get startedAt in onTestCaseResult

Determining test suites to run...onTestCaseResult: adds fail, status: failed, numExpectations: Sun Jun 23 2024 02:02:39 GMT+0530 (India Standard Time)
onTestFileResult testCaseResult 0: adds fail, status: failed, numExpectations: 0
onTestFileResult testCaseResult 0: sample, status: pending, numExpectations: 0
onTestCaseResult: test 1, status: passed, numExpectations: Sun Jun 23 2024 02:02:39 GMT+0530 (India Standard Time)
onTestCaseResult: test 2, status: passed, numExpectations: Sun Jun 23 2024 02:02:39 GMT+0530 (India Standard Time)
onTestFileResult testCaseResult 0: test 1, status: passed, numExpectations: 1    
onTestFileResult testCaseResult 1: test 2, status: passed, numExpectations: 1    
onTestCaseResult: adds ok, status: passed, numExpectations: Sun Jun 23 2024 02:02:39 GMT+0530 (India Standard Time)
onTestFileResult testCaseResult 0: adds ok, status: passed, numExpectations: 3
onTestCaseResult: sample, status: todo, numExpectations: Sun Jun 23 2024 02:02:40 GMT+0530 (India Standard Time)
onTestFileResult testCaseResult 0: sample, status: todo, numExpectations: 0

Test plan

should not break existing tests

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