New Donation Flow - Add e2e test for the new donation

[dimitur2204]

Which area(s) of Podkrepi.bg are affected? (leave empty if unsure)

Donations

Describe the feature you'd like to request

We should cover the new DonationFlow with e2e tests for the most common cases.
Since some of the components have been reused, such as the choosing of the amount, some of the old tests can be reused:
https://github.com/podkrepi-bg/frontend/blob/master/e2e/tests/regression/donation-flow/anon-donation-fixed.spec.ts
https://github.com/podkrepi-bg/frontend/blob/master/e2e/tests/regression/donation-flow/anon-donation-custom.spec.ts

Currently the flow can be found by checkout out this branch https://github.com/podkrepi-bg/frontend/tree/1272-epic-new-version-of-the-donation-flow. Keep in mind some functionality is not yet implemented.
Keep track of what is done here #1272

Describe the solution you'd like

Follow the POM model that is being used for the tests and refer to the https://playwright.dev/docs for information. You can also use the QA Discord channel.

Describe alternatives you've considered

No response