[Elastic Agent] Update dashboard filters and adding agent.* fields

[P1llus]

What does this PR do?

1. Adds field mapping definitions for agent.* fields that are missing from most datastreams, since dynamic: false we are unable to filter/search/aggregate on them properly without it.

2. Filtered out APM on certain charts, as they also use agent.name

3. Added elastic_agent* as a datastream filter for certain charts, and to filter out that datastream from others. This way we do not count our internal metrics/logging datastreams as "integrations", making them clutter the UI.

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.

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Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[elasticmachine]

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• Start Time: 2023-03-23T16:02:58.777+0000

• Duration: 14 min 37 sec

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Total	31

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
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Classes	100.0% (0/0)	💚
Methods	33.333% (25/75)	👎 -66.667
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Conditionals	100.0% (0/0)	💚

[joshdover]

LGTM based on the description only, have not tested locally

[elasticmachine]

Package elastic_agent - 1.7.0 containing this change is available at https://epr.elastic.co/search?package=elastic_agent

[elasticmachine]

Package elastic_agent - 1.8.0 containing this change is available at https://epr.elastic.co/search?package=elastic_agent

[elasticmachine]

Package elastic_agent - 1.10.1 containing this change is available at https://epr.elastic.co/search?package=elastic_agent