refactor(services/hdfs): deprecate append option#7563
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Which issue does this PR close?
Refs #6708.
Rationale for this change
HDFS append is a native write capability that only affects explicit append requests. Regular writes do not use the append path, so service config should not hide this capability for test selection.
What changes are included in this PR?
This PR enables
write_can_appendby default for HDFS and HDFS Native, keepsenable_appendas a deprecated no-op compatibility option, and removes the HDFS Native runtime append gate so backend/client errors surface naturally. HDFS fixtures that previously disabled append through service config now useOPENDAL_TEST_CAPABILITY_OVERRIDES=write_can_append=false.Are there any user-facing changes?
enable_appendis deprecated because HDFS append capability is enabled by default. Deployments that do not support append will only see backend/client errors when callers explicitly request append.AI Usage Statement
N/A.