[java] [spring] Fix annotationLibrary option being ignored in spring generator

[shybovycha]

Addresses #22045 similarly to #21992

Only register the model annotation imports based on the annotationLibrary property (either from Swagger v1, Swagger v2 or none), as documented in Config Options section of the Java generator docs.

Currently, Spring generator partially ignores the option, only removing the imports from Swagger V1, completely ignoring the Schema from by Swagger V2.

This PR addresses the annotationLibrary = none case by removing the Swagger V2 import.

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[shybovycha]

cc-ing the Java team @bbdouglas @sreeshas @jfiala @lukoyanov @cbornet @jeff9finger @karismann @Zomzog @lwlee2608 @martin-mfg

[shybovycha]

just not entirely sure why okhttp-gson-3.1-duplicated-operationid sample was created with my change 🤔

[wing328]

please resolve the merge conflicts when you've time

[wing328]

just not entirely sure why okhttp-gson-3.1-duplicated-operationid sample was created with my change 🤔

no idea either. i'll take care of it. don't worry

[shybovycha]

i have just rebased on top of master and run the ./bin/generate-samples.sh and somehow the rust samples were modified (locally, but not on CI). i wonder: could it be that the sample generator should have been ran on master (but it did not) or maybe there's some issue with the generator file patterns or something so it triggers when it shouldn't and it does not trigger when it should? 🤔