test: add 2 new promptfoo tests for add and delete pages in v2 app

[815are]

Recently we added enhancement to support creation of pages in v2 -> #3795
In this PR - added two new promptfoo tests for add and delete page in v2 app

[changeset-bot]

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Latest commit: c902002

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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