Replace TestAppSession close()/reopen() with scope based TestAppSession instance

[michael-wb]

What, How & Why?

The TestAppSession object for tracking an App/SyncManager and an AppSession was updated in PR #7528 to allow the App instance to be restarted without recreating or logging in a user to allow testing the situation where a SyncSession with a cached user tries to communicate with the server before updating the location. It was recommended in that PR's review comments to update the TestAppSession close() and reopen() functions with more of a scope-based close and open mechanism.

This PR updates this object to remove the close()/reopen() functions and adds a Config structure that is passed to the TestAppSession for configuring the app session.

☑️ 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_1324

Details

• 98 of 111 (88.29%) changed or added relevant lines in 6 files are covered.
• 53 unchanged lines in 10 files lost coverage.
• Overall coverage increased (+0.003%) to 91.089%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
test/object-store/util/test_file.cpp	61	74	82.43%

Files with Coverage Reduction	New Missed Lines	%
src/realm/uuid.cpp	1	98.48%
test/fuzz_tester.hpp	1	57.73%
test/test_index_string.cpp	1	93.48%
src/realm/mixed.cpp	3	86.46%
src/realm/sync/noinst/protocol_codec.hpp	3	76.27%
test/object-store/util/test_file.cpp	4	87.06%
src/realm/cluster_tree.cpp	7	89.37%
test/sync_fixtures.hpp	7	73.44%
src/realm/sync/noinst/server/server.cpp	11	73.65%
test/fuzz_group.cpp	15	40.99%

Totals
Change from base Build 2557:	0.003%
Covered Lines:	217337
Relevant Lines:	238598

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💛 - Coveralls