Core: Hardens widget structure injection detection against CDATA

[Daverball]

Commit message

Core: Hardens widget structure injection detection against CDATA

TYPE: Bugfix
LINK: OGC-3541

Checklist

• I have performed a self-review of my code
• I have added tests for my changes/features

[linear]

OGC-3541

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.71%. Comparing base (c012c78) to head (82bb5d3).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/core/widgets.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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