{types,graphql_test}: Adds `Result.ErrorsJoined` implementation.

[chris-ramon]

Details

• Depends on: https://github.com/graphql-go/graphql/pull/718
• types: adds Result.ErrorsJoined method.
• graphql_test: adds Result.ErrorsJoined 100& test coverage unit tests.
• .circleci/config.yml: upgrades circleci go versions.

Added in order to be able to join errors because currently Result.Errors returns an slice of errors and is common use case to have it consolidated into a single error.

This PR leverages the %w error formatting verb in order to wrap errors. Ref: https://go.dev/doc/go1.13#error_wrapping

Test Plan

:heavy_check_mark: Tested that Result.ErrorsJoined works as expected via go test -cover ...:

go clean -testcache && go test -cover -coverprofile=coverage.out ./... && go tool cover -html=coverage.out -o coverage.html; sed -i'' -e's/black/whitesmoke/g' coverage.html && open coverage.html

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