Write tests for Ballerina tutorials

[sm1990]

Description

Write tests similar to [1] for Ballerina tutorials [2]

[1] https://github.com/ballerina-platform/ballerina-dev-website/blob/e57b9e0fe6746de1b80dcc9d9741edc1c26fef28/.github/workflows/bal_in_action.yml

[2] (https://www.youtube.com/watch?v=NxyIKoHl3Dw&t=7s)

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[praneesha]

Need to update the Tutorial: Creating a service in Ballerina video on the home to Swan Lake. Currently, it is based on Ballerina 1.2.x.