JsonRPCController instances are now transient #337

Job	Run time
Pharo64-10 + app-config	59s
Pharo64-10 + app-control	56s
Pharo64-10 + app-info	29s
Pharo64-10 + core	29s
Pharo64-10 + dependent-sunit-extensions	53s
Pharo64-10 + deployment	42s
Pharo64-10 + development	56s
Pharo64-10 + examples	49s
Pharo64-10 + healthcheck	45s
Pharo64-10 + json-rpc	44s
Pharo64-10 + loggers	41s
Pharo64-10 + metrics	46s
Pharo64-10 + metrics-http	39s
Pharo64-10 + tests	53s
Pharo64-10 + tools	47s
Pharo64-11 + app-config	47s
Pharo64-11 + app-control	34s
Pharo64-11 + app-info	30s
Pharo64-11 + core	37s
Pharo64-11 + dependent-sunit-extensions	43s
Pharo64-11 + deployment	46s
Pharo64-11 + development	55s
Pharo64-11 + examples	38s
Pharo64-11 + healthcheck	32s
Pharo64-11 + json-rpc	32s
Pharo64-11 + loggers	47s
Pharo64-11 + metrics	33s
Pharo64-11 + metrics-http	33s
Pharo64-11 + tests	39s
Pharo64-11 + tools	50s
	21m 24s

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