Task result is based on sync status (#323)

* Task result is based on sync status

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Added tests for worker

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Added sample ics

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Added JUnit Android test dependency

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Made class open so that it can be used in tests

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Optimize imports

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Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>
Co-authored-by: Sunik Kupfer <kupfer@bitfire.at>