Remove test-only database methods from production interface and improve test reliability

[vfusco]

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[Copilot]

Pull request overview

This PR removes test-only database write methods from the production repository.Repository interface and updates tests to seed data through production write paths (notably CreateEpochsAndInputs and StoreAdvanceResult), improving isolation and realism of repository/jsonrpc tests.

Changes:

• Dropped TestRepository from internal/repository/repository.go and removed Postgres test-only write helpers.
• Added/updated repotest helpers/builders to seed outputs/reports via StoreAdvanceResult instead of direct inserts.
• Refactored JSON-RPC tests to use repotest builders + production repository methods and switched several assertions to require.NoError.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/repository/repotest/repotest.go	Adds a StoreAdvanceResult test helper and suite wrapper to seed outputs/reports via production bulk op.
internal/repository/repotest/report_test_cases.go	Replaces direct report creation with storeAdvanceResult seeding.
internal/repository/repotest/output_test_cases.go	Replaces direct output creation with storeAdvanceResult seeding; adjusts execution-update tests accordingly.
internal/repository/repotest/builders.go	Removes OutputBuilder/ReportBuilder; tweaks EpochBuilder.WithIndex; adds InputBuilder.WithEpochApplicationID.
internal/repository/repository.go	Removes TestRepository from the public Repository interface.
internal/repository/postgres/util.go	Removes unused addressToBytes helper (was only for removed test-only code).
internal/repository/postgres/test_only.go	Deletes PostgresRepository test-only insert methods (CreateEpoch/Input/Output/Report).
internal/jsonrpc/util_test.go	Adds repotest usage and helper methods to seed epochs/inputs/results through production APIs; uses require.
internal/jsonrpc/jsonrpc_test.go	Updates seeding logic to avoid removed test-only repository methods; adopts require.NoError in several places.

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The base branch was changed.