codecov reporting does not exclude the test folder correctly

[ihsandemir]

codecov reporting does not exclude the test folder correctly.

See the run here https://app.codecov.io/github/hazelcast/hazelcast-cpp-client/commit/066d4548cdf1d7050ae675256de790e3e863c018/tree/hazelcast?dropdown=coverage

[JackPGreen]

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