RCORE-2205 Remove unused changeset compaction code

[jbreams]

What, How & Why?

This has been hanging out in the codebase for years hidden away behind an #if 0 not doing anything. It's bit-rotted since the introduction of embedded objects.

☑️ 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 jonathan.reams_3357

Details

• 2 of 2 (100.0%) changed or added relevant lines in 2 files are covered.
• 104 unchanged lines in 15 files lost coverage.
• Overall coverage increased (+0.05%) to 91.079%

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Files with Coverage Reduction	New Missed Lines	%
src/realm/dictionary.cpp	1	85.16%
src/realm/mixed.cpp	1	86.46%
src/realm/sync/network/websocket.cpp	1	71.79%
test/test_index_string.cpp	1	93.48%
src/realm/cluster.cpp	2	75.85%
src/realm/sync/instruction_replication.cpp	3	91.48%
src/realm/unicode.cpp	3	83.83%
src/realm/util/to_string.cpp	4	92.86%
src/realm/sync/noinst/client_impl_base.cpp	5	82.14%
src/realm/bplustree.cpp	6	72.55%

Totals
Change from base Build 2512:	0.05%
Covered Lines:	216350
Relevant Lines:	237541

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💛 - Coveralls

[danieltabacaru]

Nice!