Sweep: use Symbol.for('level') when extracting label

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Description

This pull request updates the LokiTransport class within index.js to use Symbol.for('level') for extracting the log level, enhancing the way log levels are handled.

Summary

• Removed level from the destructuring assignment of info and instead, explicitly extracted it using Symbol.for('level').
• This change ensures that the log level is accurately captured, especially in scenarios where the log level is symbolically represented.
• Affected file: index.js in the LokiTransport class.

Fixes #112.

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Rollback Files For Sweep

• Rollback changes to index.js

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[JaniAnttonen]

LGTM, together with the other Sweep PR this requires a new minor release instead of a patch since the API gets changed somewhat.