RCORE-2235 Upload progress notifications should not be reported after client reset if no local changes to upload

[michael-wb]

What, How & Why?

If an empty progress [uploadable: 0, uploaded: 0] or [downloadable: 0, downloaded: 0] is received by the SyncProgressNotifier::update() function then a progress notification will not be generated for that direction.

This also addresses the issue where an upload progress notification is reported after a client reset with recovery that did not generate any pending local changes or a discard local client reset.

Fixes #7970

☑️ ToDos

• 📝 Changelog update
• 🚦 Tests (or not relevant)
• [ ] C-API, if public C++ API changed
• [ ] bindgen/spec.yml, if public C++ API changed

[coveralls-official]

Pull Request Test Coverage Report for Build michael.wilkersonbarker_1325

Details

• 39 of 39 (100.0%) changed or added relevant lines in 2 files are covered.
• 75 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-0.006%) to 91.101%

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Files with Coverage Reduction	New Missed Lines	%
src/realm/array_string.cpp	1	88.03%
test/fuzz_tester.hpp	1	57.73%
test/test_index_string.cpp	1	93.48%
src/realm/sync/noinst/server/server.cpp	3	74.32%
src/realm/unicode.cpp	3	83.83%
src/realm/table.cpp	4	90.29%
src/realm/sync/network/network.hpp	7	85.28%
test/fuzz_group.cpp	55	42.26%

Totals
Change from base Build 2561:	-0.006%
Covered Lines:	217388
Relevant Lines:	238622

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💛 - Coveralls