Remove incorrect patch-merge directives.

Directives were misplaced for the following types:

- MatchExpressions
- Taints
- Tolerations

Per the discussion in #46547, we cannot fix these because it would cause
backwards-compatibility problems. Instead, remove the incorrect ones so
they don't mislead users. This has no impact on behavior.

api/openapi-spec/swagger.json

@@ -57884,9 +57884,7 @@
     "properties": {
      "key": {
       "description": "The label key that the selector applies to.",
-      "type": "string",
-      "x-kubernetes-patch-merge-key": "key",
-      "x-kubernetes-patch-strategy": "merge"
+      "type": "string"
      },
      "operator": {
       "description": "Represents a key's relationship to a set of values. Valid operators are In, NotIn, Exists, DoesNotExist. Gt, and Lt.",
@@ -60001,9 +59999,7 @@
      },
      "key": {
       "description": "Required. The taint key to be applied to a node.",
-      "type": "string",
-      "x-kubernetes-patch-merge-key": "key",
-      "x-kubernetes-patch-strategy": "merge"
+      "type": "string"
      },
      "timeAdded": {
       "description": "TimeAdded represents the time at which the taint was added. It is only written for NoExecute taints.",
@@ -60024,9 +60020,7 @@
      },
      "key": {
       "description": "Key is the taint key that the toleration applies to. Empty means match all taint keys. If the key is empty, operator must be Exists; this combination means to match all values and all keys.",
-      "type": "string",
-      "x-kubernetes-patch-merge-key": "key",
-      "x-kubernetes-patch-strategy": "merge"
+      "type": "string"
      },
      "operator": {
       "description": "Operator represents a key's relationship to the value. Valid operators are Exists and Equal. Defaults to Equal. Exists is equivalent to wildcard for value, so that a pod can tolerate all taints of a particular category.",