Add undo trailing icon

[Pytal]

Add an "undo" icon in addition to the "close" and "arrowRight" icons

[Pytal]

For some reason this affects the NcAppSidebar cypress tests

[artonge]

Can we mark trailingButtonIcon as deprecated so we can remove it in a few major bump?

[raimund-schluessler]

For some reason this affects the NcAppSidebar cypress tests

No idea why, but the color of the favorite icon changed.
Before:

After:

[raimund-schluessler]

Could it be that a change in server now makes the cypress tests fail due to #3139? The cypress tests for a PR that got merged yesterday without issues (https://github.com/nextcloud/nextcloud-vue/actions/runs/3159764008/jobs/5152100405) now also fail. I think it is less than ideal that external changes break the tests for this repository without interaction. There is no way of catching or debugging this.

@skjnldsv @marcoambrosini

[raimund-schluessler]

I created a separate issue for this #3325

[marcoambrosini]

@Pytal We deliberately limited the functionality there to control the design a bit more. What trailing icon do you need there?

[Pytal]

Can we mark trailingButtonIcon as deprecated so we can remove it in a few major bump?

Did not mention deprecating anything?

[Pytal]

@Pytal We deliberately limited the functionality there to control the design a bit more. What trailing icon do you need there?

Would need the undo-variant icon from https://materialdesignicons.com, and had thought of adding another string undo to use this icon but thought that allowing any icon would prevent having to update the component each time a new icon is needed in the future

[Pytal]

Should we add the undo-variant icon case or allow any custom icon @marcoambrosini?

[marcoambrosini]

Yes I think we should add only undo-variant and proceed slowly keep things under control. cc @jancborchardt @nimishavijay

[Pytal]

Review-ready