Disabled python tests in tests/dragonfly

## Unconditional skips (broken / flaky / WIP)

- [x] `tests/dragonfly/shutdown_test.py:15` — class `TestDflyAutoLoadSnapshot` (covers `test_gracefull_shutdown`) — "Currently we can not guarantee that on shutdown if command is executed and value is written we response before breaking the connection"

@vyavdoshenko -> check if the invariants/what's written is true and if we can change somehow the test semantics to assert that we get a reply before we shutdown

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- [ ] `tests/dragonfly/memory_test.py:327` — `test_throttle_on_commands_squashing_replies_bytes` — "Disabling test until improvements in squashing."

@mkaruza

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- [x] `tests/dragonfly/snapshot_test.py:222` — `test_cron_snapshot_failed_saving` — "Fails and also causes all TLS tests to fail"

@BorysTheDev

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- [ ] `tests/dragonfly/snapshot_test.py:961` — `test_tiered_entries_throttle` — no reason given (also `@large`/`@opt_only`)

@dranikpg

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- [x] `tests/dragonfly/acl_family_test.py:271` — `test_acl_del_user_while_running_lua_script` — "Flaky on CI, needs investigation"

@kostasrim

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- [x] `tests/dragonfly/acl_family_test.py:297` — `test_acl_with_long_running_script` — "Check TODO in the body below"

@kostasrim

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- [x] `tests/dragonfly/connection_test.py:2483` — `test_pipeline_cache_size` — "Flaky"

@abhijat

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- [x] `tests/dragonfly/replication_specific_test.py:508` — `test_big_huge_streaming_restart` — "fails, investigating"

@kostasrim

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- [x] `tests/dragonfly/replication_specific_test.py:730` — `test_replication_onmove_flow` — "Fails constantly on CI"

Dead test https://github.com/dragonflydb/dragonfly/pull/7096 and https://github.com/dragonflydb/dragonfly/pull/7068/changes @kostasrim will remove it in a sec