Reduce bookworm-multipython docker image size

These changes reduce the size of the bookworm-multipython image from 10Gb to 6Gb by removing not needed files and tools.

Jenkins job jenkins-tools/swh-jenkins-dockerfiles #800 succeeded in 51 min.
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added 9 commits

• 01415352...6b865dee - 6 commits from branch swh/infra/ci-cd:master
• 574644f5 - bookwork-multipython: Remove installation of emscripten
• ed58b378 - bookworm-multipython: Remove copy of Python source trees
• 16cc0d20 - bookworm-multipython: Perform a minimal installation of rust

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changed title from bookwork-multipython: Remove installation of emscripten and rsvndump to Reduce bookworm-multipython docker image size

changed the description

Jenkins job jenkins-tools/swh-jenkins-dockerfiles #919 succeeded in 22 min.
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Ah, so without this, we kept the build dependencies in the docker image, heh! Nice catch.

approved this merge request

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merged manually