Refactored memory usage analysis to general diagnostics #91

Job	Run time
Format / pre-commit	26s
Format / Links	15s
PIP / Install	1m 7s
Build Cache / OpenMPI 5	41s
Domain Decomp / Unit	1m 5s
Integration / Dummy	1m 17s
Adaptivity Serial / Unit & Integration	1m 8s
Adaptivity Parallel / Unit	1m 19s
Coverage / Evaluate	1m 48s
Adaptivity Parallel / Integration	1m 16s
User-Side / Unit	1m 57s
	12m 19s

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