[HA Proxy] Add metric_type mapping to info datastream

[agithomas]

Type of Change

• Enhancement

What does this PR do?

Add metric_type mapping to info datastream of HA Proxy

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

• elastic-package build
• elastic-package stack up -v -d --services package-registry

Related issues

• relates [HA Proxy] TSDB Enablement #7138

Screenshots

[agithomas]

[elasticmachine]

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Build stats

• Start Time: 2023-07-27T11:30:22.714+0000

• Duration: 14 min 25 sec

Test stats 🧪

Test	Results
Failed	0
Passed	40
Skipped	0
Total	40

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.571
Classes	100.0% (1/1)	💚 3.571
Methods	90.476% (19/21)	👍 3.192
Lines	97.297% (180/185)	👍 4.474
Conditionals	100.0% (0/0)	💚

[ritalwar]

LGTM!

[elasticmachine]

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