fix(tests): tighten ESM test run limits to match deterministic convergence

Now that the compare-hook PRNG is seeded from the libFuzzer seed,
iteration counts are fully deterministic:

  esm_instrumentation (seed 111994470):  848,791 runs → limit 900K
  esm_cjs_mixed       (seed 111994470):   15,385 runs → limit  20K

Author: oetr

tests/esm_cjs_mixed/esm_cjs_mixed.test.js

@@ -40,7 +40,7 @@ describeOrSkip("Mixed CJS + ESM instrumentation", () => {
 			.sync(true)
 			.disableBugDetectors([".*"])
 			.expectedErrors("Error")
-			.runs(5000000)
+			.runs(20_000)
 			.seed(111994470)
 			.build();
 

tests/esm_instrumentation/esm_instrumentation.test.js

@@ -43,7 +43,7 @@ describeOrSkip("ESM instrumentation", () => {
 				.sync(syncMode)
 				.disableBugDetectors([".*"])
 				.expectedErrors("Error")
-				.runs(5000000)
+				.runs(900_000)
 				.seed(111994470)
 				.build();
 
@@ -63,7 +63,7 @@ describeOrSkip("ESM instrumentation", () => {
 			.dir(__dirname)
 			.disableBugDetectors([".*"])
 			.expectedErrors("Error")
-			.runs(5000000)
+			.runs(900_000)
 			.seed(111994470)
 			.build();