chore(eslint-plugin): switch auto-generated test cases to hand-written in no-unnecessary-condition.test.ts (#12259)

no-unnecessary-condition.test.ts hand-written

Author: Vinccool96

eslint-suppressions.json

@@ -14,11 +14,6 @@
       "count": 14
     }
   },
-  "packages/eslint-plugin/tests/rules/no-unnecessary-condition.test.ts": {
-    "@typescript-eslint/internal/no-dynamic-tests": {
-      "count": 44
-    }
-  },
   "packages/eslint-plugin/tests/rules/no-unnecessary-template-expression.test.ts": {
     "@typescript-eslint/internal/no-dynamic-tests": {
       "count": 1