[receiver/mongodbatlas] Fix log parsing for v4.2 clusters #14088
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Description:
MongoDB Atlas supports multiple MongoDB versions. v4.2 was the last version to use a non-structured log (https://www.mongodb.com/docs/v4.2/reference/log-messages/) - the next supported version begins using structured logging (https://www.mongodb.com/docs/v4.4/reference/log-messages/).
This means that v4.2 host logs must be parsed differently. Audit logs have remained JSON between versions (for 4.2: https://www.mongodb.com/docs/v4.2/reference/audit-message/#audit-message), so they didn't require any change to parse.
Link to tracking Issue: Resolves #14008
Testing: