Removing HTML from component tooltips

[robinmolen]

Closes open-formulieren/security-issues#36

Changes

Added a simplistic sanitize function that sanitizes component data when saving the component. This function removes all HTML content from the component tooltip.

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Problem detection in the admin email digest is handled

• Release management

  • I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Dockerfile/scripts

  • Updated the Dockerfile with the necessary scripts from the ./bin folder

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.73%. Comparing base (e7e8155) to head (eb970b1).
Report is 14 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5121   +/-   ##
=======================================
  Coverage   96.73%   96.73%           
=======================================
  Files         775      775           
  Lines       26662    26664    +2     
  Branches     3468     3469    +1     
=======================================
+ Hits        25792    25794    +2     
  Misses        608      608           
  Partials      262      262           

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