Support 'custom' changes being added to exporter.sourceDbChanges #646

Job	Run time
Build supported version matrix	11s
Check change files	14s
Lint Build and run Tests (4.3.5)	3m 17s
Lint Build and run Tests (4.4.9)	3m 15s
Lint Build and run Tests (4.5.2)	4m 10s
Lint Build and run Tests (4.6.2)	3m 38s
Lint Build and run Tests (4.7.8)	3m 26s
Lint Build and run Tests (4.8.7)	1m 56s
Lint Build and run Tests (4.9.7)	1m 54s
Lint Build and run Tests (4.10.2)	2m 8s
Lint Build and run Tests (USE_FROZEN_DEV_DEPS)	3m 19s
	27m 28s

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