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This PR adds an upgrade test for SSTable compression with shared dictionaries, and adds some bits to pylib and test.py to support that. In the series, we: 1. Mount $XDG_CACHE_DIR into dbuild. 2. Add a pylib function which downloads and installs a released ScyllaDB package into a subdirectory of $XDG_CACHE_DIR/scylladb/test.py, and returns the path to bin/scylla. 3. Add new methods and params to the cluster manager, which let the test start nodes with historical Scylla executables, and switch executables during the test. 4. Add a test which uses the above to run an upgrade test between the released package and the current build. 5. Add --run-internet-dependent-tests to test.py which lets the user of test.py skip this test (and potentially other internet-dependent tests in the future). (The patch modifying wait_for_cql_and_get_hosts is a part of the new test — the new test needs it to test how particular nodes in a mixed-version cluster react to some CQL queries.) This is a follow-up to https://github.com/scylladb/scylladb/pull/23025, split into a separate PR because the potential addition of upgrade tests to test.py deserved a separate thread. Needs backport to 2025.2, because that's where the tested feature is introduced. Fixes https://github.com/scylladb/scylladb/issues/24110 - (cherry picked from commit63218bb094) - (cherry picked from commitcc7432888e) - (cherry picked from commit34098fbd1f) - (cherry picked from commit2ef0db0a6b) - (cherry picked from commit1ff7e09edc) - (cherry picked from commit5da19ff6a6) - (cherry picked from commitd3cb873532) - (cherry picked from commitdd878505ca) Parent PR: https://github.com/scylladb/scylladb/pull/23538 Closes scylladb/scylladb#25158 * github.com:scylladb/scylladb: test: add test_sstable_compression_dictionaries_upgrade.py test.py: add --run-internet-dependent-tests pylib/manager_client: add server_switch_executable test/pylib: in add_server, give a way to specify the executable and version-specific config pylib: pass scylla_env environment variables to the topology suite test/pylib: add get_scylla_2025_1_executable() pylib/scylla_cluster: give a way to pass executable-specific options to nodes dbuild: mount "$XDG_CACHE_HOME/scylladb"