Revert "Merge branch 'dennis-configurable-content-security-policy' into 'main'"
What does this merge request do and why?
This MR reverts !2720 (merged) because for GDK's that have a custom hostname set, e.g. gdk.test it's causing a 'Blocked host' error:
Impacted categories
The following categories relate to this merge request:
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gdk-reliability - e.g. When a GDK action fails to complete. 
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gdk-usability - e.g. Improvements or suggestions around how the GDK functions. 
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gdk-performance - e.g. When a GDK action is slow or times out. 
Merge request checklist
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This change is backward compatible. If not, please include steps to communicate to our users. 
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Tests added for new functionality. If not, please raise an issue to follow-up. 
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Documentation added/updated, if needed. 
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Announcement added, if change is notable. 
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gdk doctortest added, if needed.
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Add the ~highlightlabel if this MR should be included in theCHANGELOG.md.
