[ti_maltiverse] Remove dotted yaml keys

[andrewkroh]

In preparation for upgrading to package-spec 3.0.0, this replaces YAML keys containing dots with an unambiguous YAML form.

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/security-external-integrations (Team:Security-External Integrations)

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• Start Time: 2023-09-13T16:59:04.314+0000

• Duration: 14 min 24 sec

Test stats 🧪

Test	Results
Failed	0
Passed	5
Skipped	0
Total	5

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚
Classes	100.0% (1/1)	💚
Methods	100.0% (12/12)	💚
Lines	64.574% (144/223)	👎 -34.271
Conditionals	100.0% (0/0)	💚