[INLONG-10508][Sort] Fix pulsar connector flink 1.15 scan start up mode parameter cannot keep consistent with flink 1.13 #10509
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Fixes #10508
Motivation
After update the default flink version to flink 1.15, the pulsar startup mode should support external-subscription value which is supported in flink 1.13
Modifications
add external-subscription value in scan.startup.mode
Documentation