fix(hugegraph): fail server start if Store health never succeeds

[weicao]

Summary

Child PR into dev/hugegraph-release-1.0. Official order is PD healthy -> Store -> Server. Server exported STORE_REST but did not wait, so it could start against a down Store.

Wait for Store /v1/health on 8520 and fail closed after the bounded wait. Attempts/sleep are overridable for tests.

Test

bash addons/hugegraph/tests/start_server_test.sh
bash addons/hugegraph/tests/contract_test.sh
HugeGraph addon offline contracts passed

Main PR: #3412
Sibling: #3417

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (f79df45) to head (e005da9).
⚠️ Report is 1 commits behind head on dev/hugegraph-release-1.0.

Additional details and impacted files

@@                    Coverage Diff                    @@
##           dev/hugegraph-release-1.0   #3418   +/-   ##
=========================================================
  Coverage                       0.00%   0.00%           
=========================================================
  Files                             69      69           
  Lines                           7275    7275           
=========================================================
  Misses                          7275    7275           

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