mgr: serialize python objects sent between subinterpreters via remote

[athanatos]

Replacement for https://github.com/ceph/ceph/pull/66071 on a branch without '/' in the name.

Show available Jenkins commands

• jenkins test classic perf Jenkins Job | Jenkins Job Definition
• jenkins test crimson perf Jenkins Job | Jenkins Job Definition
• jenkins test signed Jenkins Job | Jenkins Job Definition
• jenkins test make check Jenkins Job | Jenkins Job Definition
• jenkins test make check arm64 Jenkins Job | Jenkins Job Definition
• jenkins test submodules Jenkins Job | Jenkins Job Definition
• jenkins test dashboard Jenkins Job | Jenkins Job Definition
• jenkins test dashboard cephadm Jenkins Job | Jenkins Job Definition
• jenkins test api Jenkins Job | Jenkins Job Definition
• jenkins test docs ReadTheDocs | Github Workflow Definition
• jenkins test ceph-volume all Jenkins Jobs | Jenkins Jobs Definition
• jenkins test windows Jenkins Job | Jenkins Job Definition
• jenkins test rook e2e Jenkins Job | Jenkins Job Definition

You must only issue one Jenkins command per-comment. Jenkins does not understand comments with more than one command.