Co-authored-by: Rhys Arkins <rhys@arkins.net>

Roll back the previous refactor.

Instead of ignoring the entire .npmrc file if it contains environment variables, instead just strip out the necessary lines.

BREAKING: .npmrc files with environment variables will no longer be completely ignore - instead only the lines with variables will be stripped.

Removes support for the ignoreNpmrcFile config option.

BREAKING CHANGE: ignoreNpmrcFile is no longer supported. Use an empty string for config.npmrc instead.

Renames skipInstalls to artifactUpdateApproach and changes from boolean to enum.

BREAKING CHANGE: skipInstalls has been changed to artifactsUpdateApproach

Removes trustLevel and replaces it with 3 other options instead. No longer necessary to set anything additional is configuring `allowedPostUpgradeCommands`

BREAKING CHANGE: `trustLevel` is no longer supported and instead broken into `allowCustomCrateRegistries` , `allowScripts` , and `exposeAllEnv`.

Closes #9654