[Azure][database_account] Remove region dimension

[tetianakravchenko]

What does this PR do?

Remove recently introduced dimension - Region, because it is redundant field - see the explanation in this comment #7503 (comment)

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• 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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[zmoog]

LGTM!

[elasticmachine]

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• Start Time: 2023-09-11T12:38:04.968+0000

• Duration: 15 min 55 sec

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Passed	34
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Total	34

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (4/4)	💚
Files	100.0% (4/4)	💚
Classes	100.0% (4/4)	💚
Methods	75.758% (25/33)	👎 -24.242
Lines	100.0% (32/32)	💚 1.096
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package azure_metrics - 1.0.39 containing this change is available at https://epr.elastic.co/search?package=azure_metrics