PYTHON-5675 Fix Backpressure-related racy tests (#2653)

Author: blink1073

test/discovery_and_monitoring/unified/backpressure-server-description-unchanged-on-min-pool-size-population-error.json

@@ -22,6 +22,27 @@
     {
       "description": "the server description is not changed on handshake error during minPoolSize population",
       "operations": [
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "setupClient",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": {
+                "skip": 1
+              },
+              "data": {
+                "failCommands": [
+                  "hello",
+                  "isMaster"
+                ],
+                "appName": "authErrorTest",
+                "closeConnection": true
+              }
+            }
+          }
+        },
         {
           "name": "createEntities",
           "object": "testRunner",
@@ -46,27 +67,6 @@
             ]
           }
         },
-        {
-          "name": "failPoint",
-          "object": "testRunner",
-          "arguments": {
-            "client": "setupClient",
-            "failPoint": {
-              "configureFailPoint": "failCommand",
-              "mode": {
-                "skip": 1
-              },
-              "data": {
-                "failCommands": [
-                  "hello",
-                  "isMaster"
-                ],
-                "appName": "authErrorTest",
-                "closeConnection": true
-              }
-            }
-          }
-        },
         {
           "name": "waitForEvent",
           "object": "testRunner",

test/discovery_and_monitoring/unified/minPoolSize-error.json

@@ -27,7 +27,7 @@
   ],
   "tests": [
     {
-      "description": "Network error on minPoolSize background creation",
+      "description": "Server error on minPoolSize background creation",
       "operations": [
         {
           "name": "failPoint",
@@ -45,7 +45,7 @@
                   "isMaster"
                 ],
                 "appName": "SDAMminPoolSizeError",
-                "closeConnection": true
+                "errorCode": 91
               }
             }
           }
@@ -68,6 +68,7 @@
                     "heartbeatFrequencyMS": 10000,
                     "appname": "SDAMminPoolSizeError",
                     "minPoolSize": 10,
+                    "serverMonitoringMode": "poll",
                     "serverSelectionTimeoutMS": 1000
                   }
                 }