PMM-15308 Feature build

[theTibi]

Feature build for PMM-15308

Trims leading/trailing whitespace from 39 dashboard titles and adds a trim_titles guard to cleanup-dash.py so CI catches regressions.

• percona/pmm: PMM-15308 Trim whitespace from dashboard titles percona/pmm#5767

Ticket: https://perconadev.atlassian.net/browse/PMM-15308

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4525-94197ef
Client docker: perconalab/pmm-client-fb:PR-4525-94197ef
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4525-94197ef
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4525-94197ef.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4525-94197ef&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4525-94197ef.tar.gz

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4525-3420f91
Client docker: perconalab/pmm-client-fb:PR-4525-3420f91
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4525-3420f91
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4525-3420f91.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4525-3420f91&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4525-3420f91.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/7016/

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/7017/