Add support to run connector examples on the same Ballerina version used by the Ballerina gradle plugin

[NipunaRanasinghe]

Description:
When running the gradle build of a particular Ballerina connector, currently there's no proper way to build/run the connector examples (usually a collection of Ballerina packages) on the same Ballerina version and the docker image used by the Ballerina gradle plugin.

This may result in build failures (specially the Github workflow runs) because the module and its examples are getting built on top of 2 different Ballerina versions.

Therefore better to work on a proper resolution to support the same Ballerina docker image for the example build process as well.

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[ayeshLK]

With this improvement [1] for Ballerina gradle plugin the above limitation has been resolved.

[1] - ballerina-platform/plugin-gradle#167