[Ingest Manager] Avoid watching monitor logs

[michalpristas]

What does this PR do?

This PR differentiates beat for its purpose (normal/monitoring) and avoids monitoring output of monitoring beats.
It does it checking special tags passed in descriptor if tag is present it redirect logs to {original_path}_monitor file/socket so it is not picked up by monitor

Why is it important?

to lower CPU consumption and avoid publishing monitoring logs about monitored logs

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #18723 event]

• Start Time: 2020-05-25T14:45:35.303+0000

• Duration: 30 min 25 sec

Test stats 🧪

Test	Results
Failed	0
Passed	505
Skipped	127
Total	632

[ph]

Code LGTM, have to test it.

[michalpristas]

this seems to be a blocker for enabling monitoring on windows.