Remove 'Show Examples' command and related functionality

[madushajg]

The 'Show Examples' command is currently non-functional, and enabling it requires additional work to create the necessary samples and complete the end-to-end flow (tracked in wso2/product-ballerina-integrator#1967
).
This PR temporarily removes the command and its related functionality until the required samples are ready.

Related to: wso2/product-ballerina-integrator#1972

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