[LOGGING-2544] Removes deprecated folder parameter

[jsubirat]

Removes deprecated "folder" parameter from the Log Forwarder integration. This parameter was originally included during the beta phase, but was later removed when we discovered that we could use wildcards when specifying a file path in FluentBit.

[coveralls]

Pull Request Test Coverage Report for Build 385538576

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.02%) to 58.24%

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Files with Coverage Reduction	New Missed Lines	%
internal/agent/event_sender.go	1	72.56%
pkg/metrics/sampler/sampler_routine.go	2	94.74%

Totals
Change from base Build 385002887:	-0.02%
Covered Lines:	11238
Relevant Lines:	19296

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💛 - Coveralls