Exact search for project name in task/process search

[mnscholz]

Is your feature request related to a problem? Please describe.
As described in #5473, the task/process search page only allows to do contains search on project name.

If you have a project with a name that is part of another project name, you currently cannot display tasks/processes of the first project only. Hits for the second project will also appear.
An example where this can happen is when you have name patterns for consecutive or related projects like "Manuscripts" and "Manuscripts 2" or "Manuscripts Large Formats".

Describe the solution you'd like
It should be possible to search for the exact project name to narrow down search results.