Added update-dashboard-table functional testing #994

[Pushpajyothi]

Issue : #994

Description :
Created Functional testing for Update-dashboard-table covering positive and negative scenarios.

[tracy-french]

@Pushpajyothi Please rewrite these as unit tests where possible. We have an e2e test for dashboard management (https://github.com/awslabs/iot-application/blob/main/tests/dashboards/dashboard-management.spec.ts) which should cover many of our needs.

[Pushpajyothi]

@Pushpajyothi Please rewrite these as unit tests where possible. We have an e2e test for dashboard management (https://github.com/awslabs/iot-application/blob/main/tests/dashboards/dashboard-management.spec.ts) which should cover many of our needs.

@tracy-french ,
There are some new changes in the UI(like view, build, create dashboard button, create) and so added all in a new test for automation.
Will check and update the existing file( dashboard-management.spec.ts) for the new changes also.