PMM-12913 Migrate api endpoints to REST #11460

Job	Run time
Tests (mysql:5.6, mongo:4.4, postgres:10, perconalab/pmm-server:3-dev-latest)	4m 12s
Tests (mysql:5.7, mongo:4.4, postgres:11, perconalab/pmm-server:3-dev-latest)	3m 58s
Tests (mysql:8.0, mongo:4.4, postgres:12, perconalab/pmm-server:3-dev-latest)	4m 9s
Tests (mysql:8.0, mongo:4.4, postgres:13, perconalab/pmm-server:3-dev-latest)	4m 28s
Tests (percona:5.6, percona/percona-server-mongodb:4.4, perconalab/percona-distribution-postgresq...	4m 14s
Tests (percona:5.7, percona/percona-server-mongodb:4.4, perconalab/percona-distribution-postgresq...	4m 12s
Tests (percona:8.0, percona/percona-server-mongodb:4.4, perconalab/percona-distribution-postgresq...	4m 20s
Tests (mariadb:10.2, mongo:4.4, postgres:9.4, perconalab/pmm-server:3-dev-latest)	4m 13s
Tests (mariadb:10.3, percona/percona-server-mongodb:4.4, postgres:9.5, perconalab/pmm-server:3-de...	4m 11s
Tests (mariadb:10.4, postgres:9.6, perconalab/pmm-server:3-dev-latest)	4m 22s
	42m 19s

Provide feedback