d/neptune_engine_version: New data source

[YakDriver]

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Closes #15257
Relates #15228, #15253

Release note for CHANGELOG:

d/neptune_engine_version: New data source

The output from acceptance testing (GovCloud):

--- PASS: TestAccAWSNeptuneEngineVersionDataSource_basic (16.39s)
--- PASS: TestAccAWSNeptuneEngineVersionDataSource_defaultOnly (17.58s)
--- PASS: TestAccAWSNeptuneEngineVersionDataSource_preferred (18.74s)

The output from acceptance testing (commercial):

--- PASS: TestAccAWSNeptuneEngineVersionDataSource_basic (11.06s)
--- PASS: TestAccAWSNeptuneEngineVersionDataSource_defaultOnly (12.57s)
--- PASS: TestAccAWSNeptuneEngineVersionDataSource_preferred (13.10s)

[YakDriver]

Should we note an AWS bug in the docs? This seems to uncover a bug in the AWS API. If DBParameterGroupFamily is set to a valid value, AWS does not return any versions. This holds true for AWS SDK Go and the AWS CLI:

% aws neptune describe-db-engine-versions --engine neptune \
 --query "DBEngineVersions[] [Engine, EngineVersion, DBParameterGroupFamily]" \
 --output text | sort -u
neptune	1.0.1.0	neptune1
neptune	1.0.1.1	neptune1
neptune	1.0.1.2	neptune1
neptune	1.0.2.1	neptune1
neptune	1.0.2.2	neptune1
neptune	1.0.3.0	neptune1
% aws neptune describe-db-engine-versions --db-parameter-group-family neptune1
{
    "DBEngineVersions": []
}
% aws docdb describe-db-engine-versions --db-parameter-group-family neptune1 --engine neptune
{
    "DBEngineVersions": []
}
% aws docdb describe-db-engine-versions --db-parameter-group-family neptune1 --engine neptune --engine-version 1.0.2.2
{
    "DBEngineVersions": []
}
% aws docdb describe-db-engine-versions --engine neptune --engine-version 1.0.2.2
{
    "DBEngineVersions": [
        {
            "Engine": "neptune",
            "EngineVersion": "1.0.2.2",
            "DBParameterGroupFamily": "neptune1",
            "DBEngineDescription": "neptune",
            "DBEngineVersionDescription": "Neptune 1.0.2.2.R4",
            "ValidUpgradeTarget": [
                {
                    "Engine": "neptune",
                    "EngineVersion": "1.0.3.0",
                    "Description": "Neptune 1.0.3.0.R1",
                    "AutoUpgrade": false,
                    "IsMajorVersionUpgrade": false
                }
            ],
            "ExportableLogTypes": [
                "audit"
            ],
            "SupportsLogExportsToCloudwatchLogs": true
        }
    ]
}

[bflad]

Looks good! Similar comments as #15228 🚀

Output from acceptance testing:

--- PASS: TestAccAWSNeptuneEngineVersionDataSource_defaultOnly (13.67s)
--- PASS: TestAccAWSNeptuneEngineVersionDataSource_basic (13.92s)
--- PASS: TestAccAWSNeptuneEngineVersionDataSource_preferred (14.09s)

[ghost]

This has been released in version 3.8.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!