build: sort .PHONY rules and add test-gc-clean
The first commit sorts the .PHONY rules for the ease of updating and backporting changes to this list.
The second commit adds a test-gc-clean rule to clean the files generated during make test-gc
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
build