PMM-15091: stop double-counting RAID md devices in Disk Details

[mattiasimonato]

https://jira.percona.com/browse/PMM-15091

PR:

• PMM-15091: stop double-counting RAID md devices in Disk Details percona/pmm#5675

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4488-b38bdd0
Client docker: perconalab/pmm-client-fb:PR-4488-b38bdd0
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4488-b38bdd0
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4488-b38bdd0.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4488-b38bdd0&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4488-b38bdd0.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/6812/

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4488-901bca9
Client docker: perconalab/pmm-client-fb:PR-4488-901bca9
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4488-901bca9
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4488-901bca9.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4488-901bca9&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4488-901bca9.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/6870/