Support 'custom' changes being added to exporter.sourceDbChanges #664

Job	Run time
Check change files	9s
Build supported version matrix	2m 22s
Lint Build and run Tests (4.3.5)	2m 40s
Lint Build and run Tests (4.4.9)	2m 46s
Lint Build and run Tests (4.5.2)	2m 49s
Lint Build and run Tests (4.6.2)	2m 53s
Lint Build and run Tests (4.7.8)	2m 48s
Lint Build and run Tests (4.8.7)	1m 56s
Lint Build and run Tests (4.9.7)	1m 59s
Lint Build and run Tests (4.10.4)	1m 57s
Lint Build and run Tests (USE_FROZEN_DEV_DEPS)	2m 52s
	25m 11s

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