Add tests for invalid calendar ids, include unknown calendar id.

[ioannad]

Also homogenise format of existing tests, adding the test for unknown calendar id u-ca=notacal.

This addresses issue #3896

Two tests (argument-string-* and argument-propertybag-* are added or addended
for the following.

Duration.(round, total)'s option relativeTo,
Duration.compare's option relativeTo,
PlainDate.prototype.(equals, since, until),
PlainDate.(from, compare),
PlainDateTime.prototype.(equals, since, until),
PlainDateTime.(from, compare),
PlainMonthDay.prototype.equals,
PlainMonthDay.from,
PlainYearMonth.prototype.(equals, since, until),
PlainDate.(from, compare),
ZonedDateTime.prototype.(equals, since, until),
ZonedDateTime.(from, compare)

The tests calendar-invalid-iso-string.js with string arguments are addended
for each constructor and each withCalendar (these do not take argument bags).

[ioannad]

Found some mistakes, converting to draft while I fix them.

[ioannad]

All the mistakes are fixed, and I added new tests, this is ready for review.

[Ms2ger]

While these are indeed invalid ISO strings, I don't think they're what you meant to test

[ioannad]

I removed the second string and changed the tests to have the calendar: part directly in the property bag.

[ioannad]

@Ms2ger I noticed there were already tests for the relativeTo option for Duration.prototype.round and Duration.prototype.total, and renamed them to match the naming scheme of the other tests, also added the new invalid calendar string "notacal".

Looking at the PR "Files changed" something seems off with the marking of the renamed files, however, the test names do correspond to their contents.

FWIW I moved them using git mv test/built-ins/Temporal/Duration/prototype/round/relativeto-propertybag-calendar-invalid-iso-string.js test/built-ins/Temporal/Duration/prototype/round/relativeto-argument-propertybag-calendar-invalid-iso-string.js and git mv test/built-ins/Temporal/Duration/prototype/total/relativeto-propertybag-calendar-invalid-iso-string.js test/built-ins/Temporal/Duration/prototype/total/relativeto-argument-propertybag-calendar-invalid-iso-string.js, so I don't know why they are displayed like this.