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The introduction of the default lease deadline[^1] feature makes it so that after PS restart, `.timeline_gc()` calls in Python tests are no-ops for 10 minute after pageserver startup: the `gc_iteration()` bails with `Skipping GC because lsn lease deadline is not reached`. I did some impact analysis in the following PR. About 30 Python tests are affected: - https://github.com/neondatabase/neon/pull/12411 Rust tests that don't explicitly enable periodic GC or invoke GC manually are unaffected because we disable periodic GC by default in the `TenantHarness`'s tenant config. Two tests explicitly did `start_paused=true` + `tokio::time::advance()`, but it would add cognitive and code bloat to each existing and future test case that uses TenantHarness if we take that route. So, this PR disables the default lease deadline feature in all tests. refs - [^1]: PR that introduced default lease deadline: https://github.com/neondatabase/neon/pull/9055/files - fixes https://databricks.atlassian.net/browse/LKB-92