[QA] add e2e tests for web-extensions

[saw-jan]

JIRA: #OCISDEV-64

web-extensions that have e2e tests:

• web-app-draw-io ([test-only] setup playwright test #102)
• web-app-unzip ([test-only] extract zip test #109)

Add e2e tests for the remaining apps:

short and simple happy tests

• web-app-progress-bars @nabim777 [tests-only] add e2e test for progress bars #132
• web-app-json-viewer @nabim777 [tests-only] add e2e test for app json viewer #142
• web-app-external-sites @nabim777 [tests-only] add e2e tests for web-app-external-sites #179
• web-app-cast @saw-jan test: add e2e tests to check cast file-action #186
• web-app-importer

[saw-jan]

• web-app-importer

The available way to test this app is using the public link. but ocis public link doesn't work at the moment.
See #127

[saw-jan]

we will tests for web-app-importer after #127 is fixed.
moving the ticket to backlog