Implement monitoring of perceived responsiveness by the End-user

[bwilk]

We need to monitor end-to-end system performance and be notified about low responsiveness of the system to retroactively act on the low performance periods

[jswk]

This monitoring endpoint should perform an e2e test with cypress.
Ask front-end team for how to perform it.

[jswk]

What could the e2e test do:

1. Verify that static files are loaded correctly (css'es, js'es, images, etc)
2. Select a product
3. Go to its scenes
4. Render a scene
5. Go to the scene search and see that results load correctly
6. Select a result and verify its metadata show

Run the test in several threads preferably.

If any errors occurred then it should send an event to sentry (or a mail) with report containing:

1. performed actions
2. execution time (?)
3. errors
4. screenshots (as attachment somehow, exposed under some url?)
5. video (?, as attachment somehow, exposed under some url?)

[jswk]

Take into account cases from Jira, i.e. verify scenes actually load, as we failed to detect it ahead of time:
https://jira.cyfronet.pl/jira/projects/SWT/issues/SWT-19
https://jira.cyfronet.pl/jira/projects/SWT/issues/SWT-20