fix(mme): Fix flaky unit tests

[pruthvihebbani]

fix(mme): Fix flaky unit tests

Summary

Moved EXPECT_CALL before calling the function triggering the event in the EXPECT_CALL

Test Plan

Ran make_test_oai in a loop for half an hour without any failures.

[github-actions]

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[github-actions]

feg-workflow

    2 files  202 suites   33s ⏱️
362 tests 362 ✔️ 0 💤 0 ❌
376 runs  376 ✔️ 0 💤 0 ❌

Results for commit 0e59dac.

[github-actions]

agw-workflow

  60 files    87 suites   6m 18s ⏱️
970 tests 961 ✔️ 9 💤 0 ❌
971 runs  962 ✔️ 9 💤 0 ❌

Results for commit 0e59dac.

[ssanadhya]

Lgtm