C++ SDK cant not return the whether the partition has been registered correctly

[TszKitLo40]

Expected behavior

Tell us what should happen
C++ SDK cant not return the whether the partition has been registered correctly

Actual behavior

Tell us what happens instead

https://github.com/apache/incubator-inlong/blob/4b2223269da92aacd0cec8d40da4d624dc42ca3e/inlong-tubemq/tubemq-client-twins/tubemq-client-cpp/src/rmt_data_cache.cc#L458

In the function IsPartitionFirstReg, if part_reg_booked_ can't find the partition, it will add the partition to the map and return true. And if the function is called second time, it will also return true because the status has been set to true.

Steps to reproduce

How can we reproduce the issue

System configuration

InLong version: 0.11.0

[gosonzhang]

@TszKitLo40, yes, you are right, thanks!

I'll fix it