[Backport to 12.6] Console does not encode path set in the browser address bar

Relates to CMS-11480, see that issue for full background

Using one of the following Tomcat versions

• trunk for 9.0.8 onwards
• 8.5.x for 8.5.31 onwards
• 8.0.x for 8.0.52 onwards
• 7.0.x for 7.0.87 onwards

Steps to reproduce

1. Create archetype project and add Events using Essentials. Start the project
2. Go to localhost:8080/cms/console and browse to [events/2018/09/breakfast/breakfast|http://localhost:8080/cms/console/?1&path=/content/documents/myhippoproject/events/2018/09/breakfast/breakfast[2]]
3. Notice the [2] shown in the address bar, refresh the browser
4. This causes a 400 status error

Expected: the path to be properly encoded and to have %5B2%5D instead of [2]

Similar issue in the repository servlet when browsing to this node throught /cms/repository/ pointer to the fix in CMS-11480 comments

To be backported to all supported versions