Add csrf token to forms in search

[johannaengland]

Contributes to https://github.com/Uninett/campus-tasks/issues/45.

Where to find the forms (ordered by commit):

Upload pictures form: http://localhost/search/room/900/upload/

Add sensor forms: http://localhost/search/room/900/#!racks, add a rack, then click on "Add sensor"

Rack forms: http://localhost/search/room/900/#!racks, add a rack, then see forms (Renaming and color chooser)

Download CSV form: http://localhost/search/room/900/#!netboxinterfaces, see form under "CSV"

Edit device group form: http://localhost/search/devicegroup/ACCESS/edit/

Event handling form: Go to http://localhost/search/event/1234, select one of the available actions

Add tags to prefix form: Go to http://localhost/search/prefix/225/, see form around "Add tags" button

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (37521e7) to head (6d769d1).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@      Coverage Diff       @@
##   master   #3390   +/-   ##
==============================
==============================

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