[ISSUE-708] change @Transactional readOnly for select query

[kihwankim]

Motivation

• in spring data jpa SimpleJpaRepository class declare @Transactional but in select query they put readOnly true

Modifications

• spring data KotlinJdslJpqlExecutor class's @Transactional readOnly option changed(false -> true) for select query

Result

• in select query readOnly option changed true -> false

Closes

• closes #708

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.01%. Comparing base (95304dd) to head (e8daa7e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #710 +/- ## ======================================== Coverage 92.01% 92.01% ======================================== Files 335 335 Lines 3419 3419 Branches 203 203 ======================================== Hits 3146 3146 Misses 213 213 Partials 60 60 ```

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[shouwn]

Thanks for your help!