Convert EMBEDDING_ related codes and V1 codes used in EGW to V2

[Hazel-Datastax]

What this PR does:
Convert all the EMBEDDING_ related codes and the V1 codes used in EGW to V2.
Have another PR https://github.com/riptano/embedding-gateway/pull/154 in EGW to fit this change

Which issue(s) this PR fixes:
Fixes #2285

Checklist

• Changes manually tested
• Automated Tests added/updated
• Documentation added/updated
• CLA Signed: DataStax CLA

[github-actions]

📉 Unit Test Coverage Delta vs Main Branch

Metric	Value
Main Branch	50.47%
This PR	50.33%
Delta	🔴 -0.14%
⚠️ Coverage decreased

[github-actions]

Unit Test Coverage Report

Overall Project	50.33% -0.56%	🍏
Files changed	36.74%	❌

File	Coverage
EmbeddingProviderException.java	100%	🍏
EmbeddingProviderResponseValidation.java	90.11%	🍏
RerankingEGWClient.java	85.93%	🍏
JsonApiException.java	80.42%	🍏
ErrorCodeV1.java	70.59%	🍏
EmbeddingProvider.java	70.38% -12.8%	🍏
EmbeddingGatewayClient.java	61.9% -6.23%	❌
DataVectorizer.java	50.63% -12.77%	❌
EmbeddingProviderFactory.java	20.62% -27.58%	❌
ValidateCredentials.java	0% -3.95%	❌
PropertyBasedServiceConfigStore.java	0% -17.89%	❌
FrameworkExceptionMapper.java	0%	🍏
AwsBedrockEmbeddingProvider.java	0% -46.71%	❌
EmbeddingDeferredAction.java	0% -12.61%	❌

[github-actions]

📉 Integration Test Coverage Delta vs Main Branch (dse69-it)

Metric	Value
Main Branch	70.87%
This PR	70.77%
Delta	🔴 -0.10%
⚠️ Coverage decreased

[github-actions]

Integration Test Coverage Report (dse69-it)

Overall Project	70.77% -0.74%	🍏
Files changed	16.29%	❌

File	Coverage
EmbeddingProviderException.java	88% -12%	🍏
FrameworkExceptionMapper.java	87.71%	🍏
PropertyBasedServiceConfigStore.java	78.05% -17.89%	❌
JsonApiException.java	68.78%	🍏
ErrorCodeV1.java	63.73%	🍏
EmbeddingDeferredAction.java	57.66% -12.61%	❌
EmbeddingProviderFactory.java	57.47% -20.88%	❌
EmbeddingProvider.java	41.47% -33.65%	❌
DataVectorizer.java	39.57% -19.16%	❌
EmbeddingProviderResponseValidation.java	25.27% -34.07%	❌
ValidateCredentials.java	7.89% -3.95%	❌
RerankingEGWClient.java	0% -3.7%	❌
EmbeddingGatewayClient.java	0% -10.99%	❌
AwsBedrockEmbeddingProvider.java	0% -46.71%	❌

[github-actions]

📉 Integration Test Coverage Delta vs Main Branch (hcd-it)

Metric	Value
Main Branch	72.60%
This PR	72.50%
Delta	🔴 -0.10%
⚠️ Coverage decreased

[github-actions]

Integration Test Coverage Report (hcd-it)

Overall Project	72.5% -0.74%	🍏
Files changed	16.29%	❌

File	Coverage
EmbeddingProviderException.java	88% -12%	🍏
FrameworkExceptionMapper.java	87.71%	🍏
PropertyBasedServiceConfigStore.java	78.05% -17.89%	❌
JsonApiException.java	68.78%	🍏
ErrorCodeV1.java	63.73%	🍏
EmbeddingDeferredAction.java	57.66% -12.61%	❌
EmbeddingProviderFactory.java	57.47% -20.88%	❌
EmbeddingProvider.java	41.47% -33.65%	❌
DataVectorizer.java	39.57% -19.16%	❌
EmbeddingProviderResponseValidation.java	25.27% -34.07%	❌
ValidateCredentials.java	7.89% -3.95%	❌
RerankingEGWClient.java	0% -3.7%	❌
EmbeddingGatewayClient.java	0% -10.99%	❌
AwsBedrockEmbeddingProvider.java	0% -46.71%	❌

[tatu-at-datastax]

Looks good, just one question here (and in matching EGW PR): looks like VECTORIZE_SERVICE_TYPE_UNAVAILABLE was mapped to EMBEDDING_GATEWAY_NOT_AVAILABLE. Is this intentional? Existing fail sounds like one of providers had an issue, not EGW itself -- so should it map to EMBEDDING_PROVIDER_UNAVAILABLE instead (or EMBEDDING_PROVIDER_SERVER_ERROR or EMBEDDING_GATEWAY_PROCESSING_ERROR)?

[tatu-at-datastax]

LGTM