SQL: Allow skip of bwc tests on `check` task (#62936)
SQL: Allow skip of bwc tests on `check` task (#62936)

Bwc tests can consume much time to build and to run so it's nice to be
able to skip them when running the `check` task on the SQL module.

Introduce a new task `checkNoBwc` so one can use:
```
./gradlew -p x-pack/plugin/sql checkNoBwc
```
to skip them.

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