Prevent two beat instances with same data path from running concurrently #14069
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This PR replaces #14030 per the discussion in #14030 (comment).
Currently it's possible for two concurrently-running Beat instances to share the same data path. This can lead to issues such as #2951.
This PR implements a lock for a Beat's data path. When a Beat instance start's up, it will try to acquire a lock on the data path by creating a lock file in it. If a lock file already exists, the Beat will not be allowed to start up and an error will be emitted in the logs. When the Beat instance is stopped, the lock file is removed.