remove e2e config

[antonborisoff]

I didn't manage to reuse existing component harness classes from the app in e2e tests;
I didn't manage to configure import of pages/utils within the e2e folder;
I decided to move e2e tests to a separate repo;
base harness could be extracted into Angular local library later on;

[github-actions]

Package	Line Rate	Branch Rate
app	100%	67%
app.components.contract	100%	100%
app.components.contracts	100%	75%
app.components.home	100%	100%
app.components.login	100%	100%
app.components.not-found	100%	100%
app.guards	100%	94%
app.services.auth	100%	100%
app.services.backend-error-handler	100%	100%
app.services.busy	98%	83%
app.services.busy.tests	100%	100%
app.services.contracts	100%	100%
app.services.features	100%	100%
app.services.message-box	100%	100%
app.services.message-box.component.message	89%	100%
app.services.navigation-back	100%	100%
app.tests	97%	91%
app.tests.foundation	100%	100%
app.tests.foundation.tests	100%	100%
transloco	89%	0%
Summary	99% (389 / 394)	90% (70 / 78)