multi-index to single index tenant isolation

[notque]

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[Copilot]

Pull Request Overview

This PR migrates from a multi-index architecture (separate indexes per tenant) to a single consolidated datastream with document-level tenant isolation using a tenant_ids field.

Key Changes:

• Introduced document-level tenant isolation via tenant_ids field in OpenSearch queries
• Added validateTenantID() function to enforce tenant ID validation across all query operations
• Refactored indexName() to return a hardcoded "hermes" datastream name instead of generating per-tenant index names

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
pkg/storage/util.go	Added tenant validation function and error constants; refactored indexName() to return single datastream name
pkg/storage/opensearch.go	Updated query building to include tenant isolation filters; added tenant validation to all query methods
build/coverprofile.out	Updated test coverage data (auto-generated file)

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[github-actions]

Merging this branch will not change overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/SAP-cloud-infrastructure/hermez/pkg/storage	0.00% (ø)

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/SAP-cloud-infrastructure/hermez/pkg/storage/opensearch.go	0.00% (ø)	0	0	0
github.com/SAP-cloud-infrastructure/hermez/pkg/storage/util.go	0.00% (ø)	0	0	0

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.