test(amazonq): patch #5994 causing CI test failing

[Will-ShaoHua]

Problem

#5994 is causing CI test failure
misuse of sinon.alwaysReturned()

Solution

should use sinon.returns()

---

License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

[justinmk3]

Still some other failing tests:

 1) supplementalContextUtil
       fetchSupplementalContext
         openTabsContext
           opentabContext should include chunks if non empty:

      AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

  assert_1.default.ok(actual?.supplementalContextItems.length === 3)

      + expected - actual

      -false
      +true
      
      at Context.<anonymous> (test/unit/codewhisperer/util/supplemetalContextUtil.test.ts:43:24)

  2) supplementalContextUtil
       fetchSupplementalContext
         openTabsContext
           opentabsContext should filter out empty chunks:

      AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

  assert_1.default.ok(actual?.supplementalContextItems.length === 0)

      + expected - actual

      -false
      +true
      
      at Context.<anonymous> (test/unit/codewhisperer/util/supplemetalContextUtil.test.ts:57:24)