Temporal: Add tests for ZDT#toString timeZoneName: "critical" option

See https://github.com/tc39/proposal-temporal/pull/2397
This normative change adds a new accepted value for the timeZoneName
option in ZonedDateTime.prototype.toString().

test/built-ins/Temporal/ZonedDateTime/prototype/toString/timezonename-critical.js

@@ -0,0 +1,25 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.tostring
+description: >
+  If timeZoneName is "auto", the time zone ID should be included and prefixed
+  with "!"
+features: [Temporal]
+---*/
+
+const tests = [
+  ["UTC", "1970-01-01T01:01:01.987654321+00:00[!UTC]", "built-in UTC"],
+  ["+01:00", "1970-01-01T02:01:01.987654321+01:00[!+01:00]", "built-in offset"],
+  [{
+    getOffsetNanosecondsFor() { return 0; },
+    toString() { return "Etc/Custom"; },
+  }, "1970-01-01T01:01:01.987654321+00:00[!Etc/Custom]", "custom"],
+];
+
+for (const [timeZone, expected, description] of tests) {
+  const date = new Temporal.ZonedDateTime(3661_987_654_321n, timeZone);
+  const result = date.toString({ timeZoneName: "critical" });
+  assert.sameValue(result, expected, `${description} time zone for timeZoneName = critical`);
+}

test/built-ins/Temporal/ZonedDateTime/prototype/toString/timezonename-invalid-string.js

@@ -8,7 +8,7 @@ info: |
     sec-getoption step 10:
       10. If _values_ is not *undefined* and _values_ does not contain an element equal to _value_, throw a *RangeError* exception.
     sec-temporal-toshowtimezonenameoption step 1:
-      1. Return ? GetOption(_normalizedOptions_, *"timeZoneName"*, « String », « *"auto"*, *"never"* », *"auto"*).
+      1. Return ? GetOption(_normalizedOptions_, *"timeZoneName"*, « *"string"* », « *"auto"*, *"never"*, *"critical"* », *"auto"*).
     sec-temporal.zoneddatetime.protoype.tostring step 7:
       7. Let _showTimeZone_ be ? ToShowTimeZoneNameOption(_options_).
 features: [Temporal]

test/built-ins/Temporal/ZonedDateTime/prototype/toString/timezonename-undefined.js

@@ -8,7 +8,7 @@ info: |
     sec-getoption step 3:
       3. If _value_ is *undefined*, return _fallback_.
     sec-temporal-toshowtimezonenameoption step 1:
-      1. Return ? GetOption(_normalizedOptions_, *"timeZoneName"*, « String », « *"auto"*, *"never"* », *"auto"*).
+      1. Return ? GetOption(_normalizedOptions_, *"timeZoneName"*, « *"string"* », « *"auto"*, *"never"*, *"critical"* », *"auto"*).
     sec-temporal.zoneddatetime.protoype.tostring step 7:
       7. Let _showTimeZone_ be ? ToShowTimeZoneNameOption(_options_).
 features: [Temporal]

test/built-ins/Temporal/ZonedDateTime/prototype/toString/timezonename-wrong-type.js

@@ -8,7 +8,7 @@ info: |
     sec-getoption step 9.a:
       a. Set _value_ to ? ToString(_value_).
     sec-temporal-toshowtimezonenameoption step 1:
-      1. Return ? GetOption(_normalizedOptions_, *"timeZoneName"*, « String », « *"auto"*, *"never"* », *"auto"*).
+      1. Return ? GetOption(_normalizedOptions_, *"timeZoneName"*, « *"string"* », « *"auto"*, *"never"*, *"critical"* », *"auto"*).
     sec-temporal.zoneddatetime.protoype.tostring step 7:
       7. Let _showTimeZone_ be ? ToShowTimeZoneNameOption(_options_).
 includes: [compareArray.js, temporalHelpers.js]