Use a pinned Go version for golangci-lint.

[matthewdale]

Summary

• Copy etc/golangci-lint.sh from master, which uses a pinned Go version for running golangci-lint.
• Copy the test.yml Github workflow from master.

Background & Motivation

The golangci-lint linter uses the local Go installation discovered in GOROOT and requires a specific range of Go versions to work correctly. If the local Go installation and the golangci-lint version get out-of-sync, the linters can print confusing error messages like

mongo/integration/mtest/mongotest.go:15:2: could not import sync/atomic (-: could not load export data: internal error in importing "sync/atomic" (unsupported version: 2); please report an issue) (typecheck)
        "sync/atomic"
        ^

In master, we added a script with #1826 that pins a specific version of Go when running golangci-lint. Use that same script here.

[mongodb-drivers-pr-bot]

API Change Report

No changes found!