HYPERFLEET-1303 - feat: add JWT authentication E2E test suite

[kuudori]

What

Add new e2e/auth/ test suite validating JWT authentication enforcement, multi-issuer identity, token renewal, and upgrade path configuration.

Why

HYPERFLEET-1303 requires E2E validation that JWT authentication is correctly enforced across the deployed HyperFleet system - covering unauthenticated rejection, invalid tokens, multi-issuer support, token renewal across reconciliation cycles, and upgrade path configuration.

Changes

New test files (e2e/auth/)

• helpers.go - RequestEditorFn helpers (withoutAuth, withBearerToken) that override the client's default auth header, plus JWT crafting utilities for negative auth tests
• jwt_enforcement.go - Tier0/Negative tests: unauthenticated GET/POST rejection (AUT-001), invalid signature (AUT-002), expired token, malformed token
• multi_issuer.go - Tier0 tests: audit field population (created_by/updated_by/deleted_by), unconfigured issuer rejection, multi-SA acceptance, adapter identity verification
• token_renewal.go - Tier1/Slow tests: Sentinel and Adapter continue operating across token refresh boundaries
• upgrade_path.go - Tier0/Upgrade test: validates all 4 JWT upgrade config items (jwt.enabled, identity_claim, Sentinel auth, jwk_cert_ca_file) in a single flow

Supporting changes

• pkg/helper/matchers.go - HaveRFC9457Error Gomega matcher for RFC 9457 Problem Details validation with exact media type checking via mime.ParseMediaType
• pkg/helper/matchers_test.go - Unit tests for HaveRFC9457Error
• pkg/labels/labels.go - Auth label for test filtering
• e2e/e2e.go - Register auth suite via blank import
• go.mod/go.sum - Add golang-jwt/jwt/v5 dependency

Acceptance Criteria

• make check passes (vet, lint, unit tests)
• Auth E2E tests pass against a JWT-enabled deployment

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