PMM-14694: Drop saas dependency

[idoqo]

https://jira.percona.com/browse/PMM-14694

• PMM-14694 Reduce saas package dependency, drop Portal API percona/pmm#4900

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4182-4b5cb25
Client docker: perconalab/pmm-client-fb:PR-4182-4b5cb25
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4182-4b5cb25
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4182-4b5cb25.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4182-4b5cb25&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4182-4b5cb25.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/4838/

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4182-f835983
Client docker: perconalab/pmm-client-fb:PR-4182-f835983
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4182-f835983
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4182-f835983.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4182-f835983&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4182-f835983.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/5127/