Copy Maven GAV ability for each release and branch

In Studio Releases and Tags screen, Releases tab.
Goal is to allow people to find easily the Maven GAV for a given release.

TODO
Releases and tags

• Add a button next to the Download Package button named "Copy Maven GAV"
• When clicking the button the maven gav is copied with

  <dependency>
  <groupId>nuxeo-studio</groupId>
  <artifactId>tests-studio1</artifactId>
  <version>nxs-4468-rest-api-SNAPSHOT</version>
  </dependency>

Branch management

• Add a button in place of the maven gav named "Copy Maven GAV"
• When clicking the button the maven gav is copied with

  <dependency>
  <groupId>nuxeo-studio</groupId>
  <artifactId>tests-studio1</artifactId>
  <version>nxs-4468-rest-api-SNAPSHOT</version>
  </dependency>