Remove mappings from filebeat_input_logs

[kcreddy]

What does this PR do?

When adding filebeat_input_metrics, another datastream filebeat_input_logs was automatically added by Fleet. More information can be found here - #5077 (comment).

The filebeat_input_metrics has undergone mapping changes such as #7179, thus making mappings undee filebeat_input_logs irrelevant. Since this datastream is only a placeholder and is always empty, this PR removes the mappings for it completely.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Note:

• File packages/elastic_agent/data_stream/filebeat_input_logs/fields/base-fields.yml was not removed as package-spec requires atleast 1 file under fields folder. This file contains only base datastream fields data_stream.*

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• Start Time: 2023-09-11T10:56:27.522+0000

• Duration: 14 min 5 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚 2.614
Classes	100.0% (0/0)	💚 2.614
Methods	33.333% (25/75)	👎 -59.235
Lines	100.0% (0/0)	💚 11.371
Conditionals	100.0% (0/0)	💚

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Package elastic_agent - 1.13.0 containing this change is available at https://epr.elastic.co/search?package=elastic_agent