feat(vertexai): Add ignore_read: true to featureNormType because API doesn't return it

[shotarok]

hashicorp/terraform-provider-google#12818

Add ignore_read: true to featureNormType because API doesn't return it. I put a sample response from https://cloud.google.com/vertex-ai/docs/reference/rest/v1/projects.locations.indexes/get.

Details

$ curl -X GET \
  -H "Authorization: Bearer $(gcloud auth application-default print-access-token)" \
  -H "Content-Type: application/json; charset=utf-8" \
  https://us-west1-aiplatform.googleapis.com/v1/projects/xxxxx/locations/us-west1/indexes/yyyyyy
{
  "name": "projects/xxxxx/locations/us-west1/indexes/yyyyyy",
  "displayName": "image",
  "description": "index for image embeddings",
  "metadataSchemaUri": "gs://google-cloud-aiplatform/schema/matchingengine/metadata/nearest_neighbor_search_1.0.0.yaml",
  "metadata": {
    "config": {
      "dimensions": 512,
      "approximateNeighborsCount": 150,
      "distanceMeasureType": "DOT_PRODUCT_DISTANCE",
      "algorithmConfig": {
        "treeAhConfig": {
          "leafNodeEmbeddingCount": "1000",
          "leafNodesToSearchPercent": 10
        }
      },
      "shardSize": "SHARD_SIZE_MEDIUM"
    }
  },
  "deployedIndexes": [
    {
      "indexEndpoint": "projects/xxxxx/locations/us-west1/indexEndpoints/zzzzzzz",
      "deployedIndexId": "all_items_index"
    }
  ],
  "etag": "AMEw9yMNTVf04pTQQ8AgKhgTuf3EgU0E6kMVg6xXd5SlGegGiQIIhh0Tss2Ko5__bUI=",
  "createTime": "2023-05-24T05:13:10.102697Z",
  "updateTime": "2023-07-06T23:44:31.005485Z",
  "indexStats": {
    "vectorsCount": "59914820",
    "shardsCount": 7
  },
  "indexUpdateMethod": "STREAM_UPDATE"
}

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Generated Terraform providers, and ran make test and make lint in the generated providers to ensure it passes unit and linter tests.
• Ran relevant acceptance tests using my own Google Cloud project and credentials (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read Write release notes before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

vertexai: fixed `feature_norm_type` in `google_vertex_ai_index` to avoid it from appearing repeatedly in terraform plan

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Hi there, I'm the Modular magician. I've detected the following information about your changes:

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Tests analytics

Total tests: 2831
Passed tests 2533
Skipped tests: 295
Affected tests: 3

Action taken

Found 3 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccContainerAwsNodePool_BetaBasicHandWritten|TestAccSpannerInstanceIamPolicy|TestAccComputeFirewallPolicyRule_multipleRules

Get to know how VCR tests work

[modular-magician]

Tests passed during RECORDING mode:
TestAccSpannerInstanceIamPolicy[Debug log]

Tests failed during RECORDING mode:
TestAccContainerAwsNodePool_BetaBasicHandWritten[Error message] [Debug log]
TestAccComputeFirewallPolicyRule_multipleRules[Error message] [Debug log]

Please fix these to complete your PR
View the build log or the debug log for each test

[ScottSuarez]

Verified that the field is absent in the response.. Thanks for the work!