Show dialog when completing action but not logged in

[JElgar]

Description

Currently when the user is not logged in we show them buttons on the action info page which they can click to complete the action. If they click that button they get a 403.
Instead this updates the button to show a dialog saying they need to login.
It also updates to login to take an "inititalRoute" parameter. This can be used to set the route which should be navigated to after login (or skip) is complete.
This is used in the action flow so that the user is returned to the same action page after logging in

Fixes #291

Checklist:

Creator

• The target branch is main
• I have updated the unreleased section of the change log
• I have reviewed the 'files changed' tab on github to ensure all changes are as expected
• I have added someone to review the pr

Reviewer

• I have verified the above are all completed
• I have run the code locally to ensure it fufills the requirements of the issue
• I have reviewed the 'files changed' and commented on any sections which I think are not needed, incorrect or could be improved

After pull

• If appropriate I have closed the issue/ moved the trello card