[Azure] [Container Service] Normalize azure.dimensions.status metric values to lowercase

[zmoog]

What does this PR do?

Since values from Azure come in lowercase and capitalized versions (e.g., True/true/False/false), we picked lowercase as canonical case for these values.

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.

Related issues

• Closes [Azure] [container_service] Handle boolean values #7220

Screenshots

Before:

After normalization:

[elasticmachine]

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Build stats

• Start Time: 2023-08-31T06:02:45.107+0000

• Duration: 15 min 29 sec

Test stats 🧪

Test	Results
Failed	0
Passed	34
Skipped	0
Total	34

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (4/4)	💚
Files	100.0% (4/4)	💚 3.362
Classes	100.0% (4/4)	💚 3.362
Methods	75.758% (25/33)	👎 -16.072
Lines	100.0% (32/32)	💚 11.691
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package azure_metrics - 1.0.35 containing this change is available at https://epr.elastic.co/search?package=azure_metrics