Improve coverage for BigInt relational comparison tests (#1251)

...ge/expressions/greater-than-or-equal/bigint-and-bigint.js

...xpressions/greater-than-or-equal/bigint-and-non-finite.js

...sions/greater-than-or-equal/bigint-and-number-extremes.js

...ge/expressions/greater-than-or-equal/bigint-and-number.js

test/language/expressions/greater-than/bigint-and-bigint.js

...anguage/expressions/greater-than/bigint-and-non-finite.js

...ge/expressions/greater-than/bigint-and-number-extremes.js

test/language/expressions/greater-than/bigint-and-number.js

...guage/expressions/less-than-or-equal/bigint-and-bigint.js

...e/expressions/less-than-or-equal/bigint-and-non-finite.js

...ressions/less-than-or-equal/bigint-and-number-extremes.js

...guage/expressions/less-than-or-equal/bigint-and-number.js

test/language/expressions/less-than/bigint-and-bigint.js

test/language/expressions/less-than/bigint-and-non-finite.js

...guage/expressions/less-than/bigint-and-number-extremes.js

test/language/expressions/less-than/bigint-and-number.js