Change Share icon and improve layout of item header actions

[spaenleh]

In this PR I propose to change the Share icon to better represent that this menu is related to sharing with people.

Previously:

Proposed change:

And the link box was styled with the text-overflow: ellipsis to better show the link could not be displayed fully:

IconButtons were also all wrapped in spans to ensure they stay round.

TODO:

• create a version of @graasp/ui with the changes from 242 change share button icon graasp-ui#245 and graasp/graasp-ui@8877111

Change Favorite Items icon from a heart to a star to be in ligne with the Add to Favorites icon in item actions.

closes #550

[pyphilia]

Looks good! I feel like the new share button is smaller than the other ones?

[spaenleh]

Thank you for the review @pyphilia. I don't think it is smaller but i might appear a bit smaller due to the design:

Do you think it is an issue ? I don't think we should "compensate" visually by making the icon bigger.
Do you see an icon in the MUI Material Icons list that would be better suite ?
Maybe the Group icon which displays 2 people instead of 3 ?