chore: move oclif config and misc cleanup

[eablack]

https://gus.lightning.force.com/lightning/r/ADM_Work__c/a07EE00002SvVRLYA3/view

Description

This PR moves oclif configuration to a separate file, updates dependencies, and performs code cleanup.

Oclif Configuration:

• Move oclif configuration from package.json to separate oclif.config.mjs file
• Improves maintainability by separating concerns and aligning with oclif v4 best practices
• Updates node update script to update the oclif config file instead of package.json

README update

• Revise our very old Overview description of the cli

Unneeded toolchain cleanup:

• Remove Yarn configuration files (.yarn/, .yarnrc.yml)
• Delete .prettierrc
• Delete unused Dockerfile.devcenter and Snap packaging files (snap/)
• Remove standard, mkdirp, and read-pkg from package.json

ESLint fixes and updates:

• Fix issue where we were unintentionally ignoring all lib source and test files
• Fix lint errors across ~40 library files following the bug fix
• Remove .eslintignore-lib file (consolidated into main eslint config)
• Move to a .js based config file (eslint 9 and above will require this)

Dependency Updates:

• Update oclif CLI from v4.22.27 to v4.22.65
• Relax @oclif/core version constraint from ^4.3.0 to ^4 for better compatibility
• Updates node to 22.22.0
• cspell, eslint-plugin-n, eslint-config-oclif, lolex and tmp minor updates

Package Lock Updates:

• Regenerate package-lock.json with updated dependencies
• Net reduction of ~3,900 lines due to dependency tree optimization

[tlowrimore-heroku]

Whew! Ok, this all looks good! Happy to see all these linter warnings get addressed.