refactor(router): only load configured flavor module #29336

Job	Run time
build / Build dependencies	12s
DB-less integration tests	17m 10s
PDK tests	3m 40s
Lint, Doc and Unit tests	6m 30s
Postgres integration - first (01-04) tests	18m 19s
Postgres integration - second (>= 05) tests	21m 43s
Postgres plugins - first (01-04) tests	8m 52s
Postgres plugins - second (>= 05) tests	11m 58s
Luacov stats aggregator	0s
	1h 28m 24s

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