Pause Oban queues in all mix tasks

Mix tasks that call app.start were also booting Oban's cron scheduler,
causing PropagationGridWorker and other cron jobs to fire during
backfills. Add Oban.pause_all_queues(Oban) immediately after app.start
in every mix task that only needs Repo access.

lib/mix/tasks/backtest.ex

@@ -32,6 +32,7 @@ defmodule Mix.Tasks.Backtest do
   @impl Mix.Task
   def run(argv) do
     Mix.Task.run("app.start")
+    Oban.pause_all_queues(Oban)
 
     {opts, _, _} =
       OptionParser.parse(argv,

lib/mix/tasks/era5_backfill.ex

@@ -27,6 +27,7 @@ defmodule Mix.Tasks.Era5Backfill do
   @impl Mix.Task
   def run(args) do
     Mix.Task.run("app.start")
+    Oban.pause_all_queues(Oban)
 
     limit =
       case args do

lib/mix/tasks/hrrr_backfill.ex

@@ -28,6 +28,7 @@ defmodule Mix.Tasks.HrrrBackfill do
   @impl Mix.Task
   def run(args) do
     Mix.Task.run("app.start")
+    Oban.pause_all_queues(Oban)
 
     {opts, _, _} = OptionParser.parse(args, switches: [all: :boolean, limit: :integer])
     refetch_all? = Keyword.get(opts, :all, false)

lib/mix/tasks/hrrr_climatology.ex

@@ -17,6 +17,7 @@ defmodule Mix.Tasks.HrrrClimatology do
   @impl Mix.Task
   def run(argv) do
     Mix.Task.run("app.start")
+    Oban.pause_all_queues(Oban)
 
     {opts, _, _} = OptionParser.parse(argv, switches: [min_samples: :integer])
     min_samples = Keyword.get(opts, :min_samples, 3)

lib/mix/tasks/hrrr_native_backfill.ex

@@ -26,6 +26,7 @@ defmodule Mix.Tasks.HrrrNativeBackfill do
   @impl Mix.Task
   def run(argv) do
     Mix.Task.run("app.start")
+    Oban.pause_all_queues(Oban)
 
     {opts, _, _} = OptionParser.parse(argv, switches: [limit: :integer])
     limit = Keyword.get(opts, :limit, 50)

lib/mix/tasks/hrrr_native_derive.ex

@@ -23,6 +23,7 @@ defmodule Mix.Tasks.HrrrNativeDeriveFields do
   @impl Mix.Task
   def run(argv) do
     Mix.Task.run("app.start")
+    Oban.pause_all_queues(Oban)
 
     {opts, _, _} = OptionParser.parse(argv, switches: [limit: :integer])
     limit = Keyword.get(opts, :limit, 10_000)

lib/mix/tasks/reset_enrichment.ex

@@ -21,6 +21,7 @@ defmodule Mix.Tasks.ResetEnrichment do
   @impl Mix.Task
   def run(_args) do
     Mix.Task.run("app.start")
+    Oban.pause_all_queues(Oban)
 
     {count, _} =
       Contact