Fix mongodb logs overview dashboard and default logs path

[ritalwar]

• Bug

What does this PR do?

This PR updates the default path for mongoldb logs and also fix the dashboard to filter logs data specific to mongodb.log dataset.

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.

How to test this PR locally

Related issues

• Closes [mongodb integration] Logs MongoDB Overview dashboard does not filter properly only on mongodb logs #6114

Screenshots

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Build stats

• Start Time: 2023-05-30T16:37:51.619+0000

• Duration: 19 min 47 sec

Test stats 🧪

Test	Results
Failed	0
Passed	24
Skipped	0
Total	24

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (3/3)	💚
Classes	100.0% (3/3)	💚
Methods	96.97% (32/33)	👍 2.852
Lines	68.217% (88/129)	👎 -25.286
Conditionals	100.0% (0/0)	💚

[lucian-ioan]

LGTM, system tests pass 👍

[elasticmachine]

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