Resolves JIRA [WSTEAM1-1408]

Overall changes

Populates 'x2' ATI value for Piano with 'lite' for .lite pages

Code changes

• Sets the Platform value to 'lite' for .lite pages. (Follows pattern already put in place by .app)
• Sets AppType value to 'lite' for .lite pages
• Refactors integrationTest to make the platform more explicit

Testing

1. Visit any .lite page on latest. E.g. https://www.bbc.com/afrique/articles/cn01kyjj230o.lite
2. Visit the same page locally E.g. http://localhost:7080/afrique/articles/cn01kyjj230o.lite?renderer_env=live
3. For each, go to the Network Tab and filter by 'Fetch/XHR'
4. Compare the analytics request. All values should match apart from 'x2:'. Locally this should be [lite] and not [responsive]

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