[MAINT] Create custom golangci-lint to integrate tfproviderlint

[deiga]

Before the change?

• Not able to use tfproviderlint as part of golangci-lint

After the change?

• Capable to use tfproviderlint as part of golangci-lint
• Capable of adding new checks for the terraform provider schema
  • Example: tools/tfproviderlint/checks/L001/L001.go
• Add 3 custom linter rules
  • L001: Instructs to use ValidateDiagFunc instead of ValidateFunc
  • L002: Instructs to use Context-aware CRUD functions
  • L003: Instructs to not call any CRUD functions directly
• Enable all tfproviderlint checks, which seem sensible and don't require fixes right now
• Add make lint-new to run stricter linters on only code since main
• Refactor ci.yaml workflow, to run linters in parallel using golangci-lint-action
  • This enables inline linter complaints in PRs

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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