PMM-12832 Add exporter connection timeout to DSN/config based exporters.

[JiriCtvrtka]

https://jira.percona.com/browse/PMM-12832

PMM PR: percona/pmm#5275

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4310-9e1e330
Client docker: perconalab/pmm-client-fb:PR-4310-9e1e330
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4310-9e1e330
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4310-9e1e330.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4310-9e1e330&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4310-9e1e330.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/5876/

[JNKPercona]

Looks like there are outdated source branches.
Please update them and restart the job
percona/grafana#888

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4310-639c384
Client docker: perconalab/pmm-client-fb:PR-4310-639c384
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4310-639c384
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4310-639c384.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4310-639c384&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4310-639c384.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/5932/

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4310-6379dde
Client docker: perconalab/pmm-client-fb:PR-4310-6379dde
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4310-6379dde
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4310-6379dde.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4310-6379dde&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4310-6379dde.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/5959/