[FLINK-34727][REST]fix rest request writer future not return #24525
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What is the purpose of the change
"thenAccept()" did not return sendResponse's future, causing the server shutdown process before the request was sent complete.
Brief change log
change AbstractRestHandler respondToRequest return sendRequest inner future
Verifying this change
@Public(Evolving)
: noDocumentation
[FLINK-34727][REST]fix rest request writer future not return