[Temporal] Remove test/staging/Temporal/v8/calendar-year.js

And move tests into separate files for each type.

Author: catamorphism

test/built-ins/Temporal/PlainDate/prototype/year/basic.js

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+// Copyright (C) 2026 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.year
+description: The "year" property of Temporal.PlainDate.prototype
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.PlainDate(2021, 7, 15)).year, 2021);
+assert.sameValue(Temporal.PlainDate.from('2019-03-15').year, 2019);

test/built-ins/Temporal/PlainDateTime/prototype/year/basic.js

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+// Copyright (C) 2026 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindatetime.prototype.year
+description: The "year" property of Temporal.PlainDateTime.prototype
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.PlainDateTime(2021, 7, 15, 15, 30, 26, 123, 456, 789)).year, 2021);
+assert.sameValue(Temporal.PlainDateTime.from('2019-03-15T15:30:26').year, 2019);

test/built-ins/Temporal/PlainYearMonth/prototype/year/basic.js

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+// Copyright (C) 2026 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.year
+description: The "year" property of Temporal.PlainYearMonth.prototype
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.PlainYearMonth(2021, 7)).year, 2021);
+assert.sameValue(Temporal.PlainYearMonth.from('2019-03').year, 2019);

test/built-ins/Temporal/ZonedDateTime/prototype/year/basic.js

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+// Copyright (C) 2026 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.zoneddatetime.prototype.year
+description: The "year" property of Temporal.ZonedDateTime.prototype
+features: [Temporal]
+---*/
+
+assert.sameValue((new Temporal.ZonedDateTime(0n, "UTC")).year, 1970);
+assert.sameValue(Temporal.ZonedDateTime.from('2019-03-15T15:30:26+00:00[UTC]').year, 2019);