chore: misc repository maintenance

[mattjohnsonpint]

#807 broke the linter workflows. These changes are as a direct result.

• Ensure all workflows with path filters include the workflow file. That would have caught this in the checks for chore(deps): Update golangci/golangci-lint-action action to v7 #807 itself.
• Add a config file for golangci-lint. Put it in the Trunk configs dir, so Trunk will use it also.
• Address remaining linter warnings coming out of the new golangci-lint
• Update Trunk and all Trunk plugins to latest.

Note that Trunk is still using v1 of golangci-lint. When it updates to v2, then I'll remove the separate linting workflows and we can just use Trunk alone.

[Copilot]

Copilot reviewed 26 out of 26 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

sdk/go/pkg/graphql/graphql.go:32

• [nitpick] The error message now starts with a lower-case letter; please confirm that this formatting style is consistently applied across the codebase according to our guidelines.

return nil, errors.New("failed to execute the GQL query")