Removed e2etest.yaml

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Created e2etest.yaml

Used the existing file template from this PR:
EVerest#23

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Currently testing only with ubuntu-latest OS.
The demo scripts used are:
- demo-automated-testing.sh

I have commented out the existing /demo-iso15118-2-ac-plus-ocpp201.sh since as per the Readme.md it requires arguments to be passed and I am unsure which set of arguments need to be passed for the purpose of the workflow.
https://github.com/EVerest/everest-demo#step-1-run-the-demo

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