Work on gcp-demo repo improving tasks

[dilanSachi]

Description: Worked on the following issues. (Created this issue to track this in the ballerina-platform project board)

• https://github.com/ballerina-guides/gcp-microservices-demo/issues/73
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/71
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/70
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/69
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/68
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/61
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/28
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/35
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/38
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/39
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/40
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/41
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/42
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/44
• https://github.com/ballerina-guides/gcp-microservices-demo/issues/45

[dilanSachi]

Closing since this is completed now