Revert "PMM-8655 Send unsent messages after connection problems (#1970)" #10380

Job	Run time
Tests (mysql:5.6, mongo:4.2, postgres:10, percona/pmm-server:2.0.0)	4m 7s
Tests (mysql:5.7, mongo:4.4, postgres:11, percona/pmm-server:2.0.1)	4m 1s
Tests (mysql:8.0, mongo:4.4, postgres:12, percona/pmm-server:2.1.0)	4m 35s
Tests (mysql:8.0, mongo:4.4, postgres:13, percona/pmm-server:2.2.0)	4m 8s
Tests (percona:5.6, percona/percona-server-mongodb:4.2, perconalab/percona-distribution-postgresq...	4m 14s
Tests (percona:5.7, percona/percona-server-mongodb:4.4, perconalab/percona-distribution-postgresq...	4m 20s
Tests (percona:8.0, percona/percona-server-mongodb:4.4, perconalab/percona-distribution-postgresq...	4m 41s
Tests (mariadb:10.2, mongo:4.4, postgres:9.4, perconalab/pmm-server:dev-latest)	4m 32s
Tests (mariadb:10.3, percona/percona-server-mongodb:4.4, postgres:9.5, perconalab/pmm-server:dev-...	4m 5s
Tests (mariadb:10.4, postgres:9.6, perconalab/pmm-server:dev-latest)	4m 22s
	43m 5s

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