Bug 32932: Update router to use object references - agreements

Bug 32932: Update router to use object references - agreements

This patch updates the Vue files for ERM to use router object links rather than urls - this will make it much simpler to maintain the router if urls need to be updated. This first patch only updates the files in the agreements section of ERM as a first step to introduce the topic for discussion.

Test plan:
1) Apply patch
2) Navigate to the Agreements section of ERM and click on different navigation links/buttons
3) The links/buttons should all work as normal
4) Review the code to see that the component files now refer back to the router using objects rather than url strings

Signed-off-by: Agustin Moyano <agustinmoyano@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>