[refactor] Enable and fix linter issues

[ianlewis]

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The following unchecked golangci-lint linters are currently generating issues and disabled. We need to enable them and fix the issues encountered.

• [ ] errcheck
• [ ] errorlint
• [ ] exportloopref
• [ ] gocritic
• [ ] godox
• [ ] goerr113
• [ ] gosec
• [ ] govet
• [ ] lll
• [ ] nestif
• [ ] paralleltest
• [ ] stylecheck
• [ ] thelper
• [ ] wrapcheck