refactor: address linter warnings, apply gopls recommendations

[burningalchemist]

This pull request introduces improvements to code readability, functionality, and documentation across several files in the project. Key changes include adding package-level comments, improving code clarity by replacing nested loops with utility functions, and ensuring consistent naming conventions.

Documentation Enhancements:

• Added package-level comments to config/config.go and exporter.go to provide an overview of the functionality and purpose of the respective packages. ([[1]](https://github.com/burningalchemist/sql_exporter/pull/787/files#diff-fe44f09c4d5977b5f5eaea29170b6a0748819c9d02271746a20d81a5f3efca17R1-R2), [[2]](https://github.com/burningalchemist/sql_exporter/pull/787/files#diff-e4987a222ab3e846614998485952d8ee42288062a30929290cf3ea0e815d5ae1R1-R12))

Code Simplifications:

• Replaced nested loops with the slices.Contains utility function to simplify duplicate checks in config/util.go and target filtering in exporter.go. ([[1]](https://github.com/burningalchemist/sql_exporter/pull/787/files#diff-9330cd3477bf68add7a143059fefbe02e5664d5b83b8fd5c7ebf2d1c3921a200L16-L21), [[2]](https://github.com/burningalchemist/sql_exporter/pull/787/files#diff-e4987a222ab3e846614998485952d8ee42288062a30929290cf3ea0e815d5ae1L186-L190))

Naming Consistency:

• Renamed variables in config/util.go to follow camelCase conventions (e.g., cref_resolved to crefResolved) for better readability and consistency. ([[1]](https://github.com/burningalchemist/sql_exporter/pull/787/files#diff-9330cd3477bf68add7a143059fefbe02e5664d5b83b8fd5c7ebf2d1c3921a200L31-R30), [[2]](https://github.com/burningalchemist/sql_exporter/pull/787/files#diff-9330cd3477bf68add7a143059fefbe02e5664d5b83b8fd5c7ebf2d1c3921a200L40-R42))

Minor Improvements:

• Added a new utility function TrimMissingCtx in exporter.go to clarify its purpose and improve log context handling. ([exporter.goR243-L242](https://github.com/burningalchemist/sql_exporter/pull/787/files#diff-e4987a222ab3e846614998485952d8ee42288062a30929290cf3ea0e815d5ae1R243-L242))
• Updated the comment for the AwsSecret struct in config/target_config.go to provide a more descriptive explanation of its role. ([config/target_config.goL60-R60](https://github.com/burningalchemist/sql_exporter/pull/787/files#diff-0cc31906e1b4e1346602ee8a16ea22747c7640fa8a2760f9b269d40ead6ec5feL60-R60))

[Copilot]

Pull Request Overview

This PR addresses linting warnings and applies gopls recommendations to improve code quality, readability, and consistency across the sql_exporter project. The changes focus on documentation enhancements, code simplifications using modern Go utilities, and naming convention improvements.

Key changes include:

• Added comprehensive package-level documentation for better code understanding
• Replaced manual loops with slices.Contains utility function for improved readability and performance
• Updated variable naming to follow proper camelCase conventions

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
exporter.go	Added package documentation, simplified target filtering with slices.Contains, and improved TrimMissingCtx function documentation
config/util.go	Replaced nested loops with slices.Contains for duplicate checking and renamed variables to follow camelCase conventions
config/target_config.go	Enhanced AwsSecret struct comment to be more descriptive
config/config.go	Added package-level documentation

Comments suppressed due to low confidence (2)

exporter.go:12

• The slices package was introduced in Go 1.21. Ensure your project's go.mod file specifies a minimum Go version of 1.21 or higher to use this package.

	"slices"

config/util.go:7

• The slices package was introduced in Go 1.21. Ensure your project's go.mod file specifies a minimum Go version of 1.21 or higher to use this package.

	"slices"