PMM-12913 Migrate api endpoints to REST #11654

Job	Run time
Tests (mysql:5.6, mongo:4.4, postgres:10, perconalab/pmm-server:3-dev-latest)	6m 44s
Tests (mysql:5.7, mongo:4.4, postgres:11, perconalab/pmm-server:3-dev-latest)	6m 41s
Tests (mysql:8.0, mongo:4.4, postgres:12, perconalab/pmm-server:3-dev-latest)	6m 41s
Tests (mysql:8.0, mongo:4.4, postgres:13, perconalab/pmm-server:3-dev-latest)	6m 57s
Tests (percona:5.6, percona/percona-server-mongodb:4.4, perconalab/percona-distribution-postgresq...	6m 43s
Tests (percona:5.7, percona/percona-server-mongodb:4.4, perconalab/percona-distribution-postgresq...	1m 11s
Tests (percona:8.0, percona/percona-server-mongodb:4.4, perconalab/percona-distribution-postgresq...	1m 25s
Tests (mariadb:10.2, mongo:4.4, postgres:9.4, perconalab/pmm-server:3-dev-latest)	6m 28s
Tests (mariadb:10.3, percona/percona-server-mongodb:4.4, postgres:9.5, perconalab/pmm-server:3-de...	6m 39s
Tests (mariadb:10.4, postgres:9.6, perconalab/pmm-server:3-dev-latest)	6m 45s
	56m 14s

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