Fix mappings of flattened fields in azure billing and application insights packages

[jsoriano]

What does this PR do?

Fix mappings of flattened fields in azure billing and application insights packages.

Previous code generates this unexpected mapping:

                "tags": {
                  "properties": {
                    "*": {
                      "type": "flattened"
                    }
                  }
                }

With this change, this mapping is generated:

                "tags": {
                  "type": "flattened"
                }

We also take the opportunity to increase the format spec version and fix duplicated field definitions.

These issues were identified in elastic/package-spec#527 (comment).

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.

Author's Checklist

• [ ]

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[mrodm]

/test

[mrodm]

LGTM

[jsoriano]

/test

[jsoriano]

/test

[elasticmachine]

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• Start Time: 2023-07-24T22:43:41.218+0000

• Duration: 15 min 55 sec

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Passed	25
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Total	25

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚
Classes	100.0% (0/0)	💚
Methods	66.667% (6/9)	❕
Lines	100.0% (0/0)	💚
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package azure_application_insights - 1.0.6 containing this change is available at https://epr.elastic.co/search?package=azure_application_insights

[elasticmachine]

Package azure_billing - 1.1.3 containing this change is available at https://epr.elastic.co/search?package=azure_billing