unreliable test: prepareRepoData Performance Tests

[Hweinstock]

Test Details

• Name of test: prepareRepoData Performance Tests
• OS of failure: Linux (Integ)
• VSCode version of failure (minimum/insider/stable): stable
• Link to failing run:e54d549
• Link to failing test:

  aws-toolkit-vscode/packages/core/src/testInteg/perf/prepareRepoData.test.ts

  Lines 70 to 80 in 085ad38

  	describe('prepareRepoData', function () {
  	describe('Performance Tests', function () {
  	afterEach(function () {
  	sinon.restore()
  	})
  	performanceTestWrapper(10, 1000)
  	performanceTestWrapper(50, 500)
  	performanceTestWrapper(100, 100)
  	performanceTestWrapper(250, 10)
  	})
  	})

Log of Test Failure

AssertionError [ERR_ASSERTION]: Expected total user CPU usage for handles 10 files of size 1000 bytes to be less than 200. Actual user CPU usage was 240.89446059590207
    at assertPerformanceMetrics (/codebuild/output/src3874270705/src/github.com/aws/aws-toolkit-vscode/packages/core/src/shared/performance/performance.ts:182:11)
    at Context.<anonymous> (/codebuild/output/src3874270705/src/github.com/aws/aws-toolkit-vscode/packages/core/src/shared/performance/performance.ts:160:13)
    at Context.fn (/codebuild/output/src3874270705/src/github.com/aws/aws-toolkit-vscode/packages/core/src/test/setupUtil.ts:34:24)
    at processImmediate (node:internal/timers:483:21)
    at process.topLevelDomainCallback (node:domain:161:15)
    at process.callbackTrampoline (node:internal/async_hooks:128:24)

      + expected - actual

      -false
      +true
      ```

## Additional Information

[Hweinstock]

skipped in #6459