Hide pluggable extension columns by default on entity tables

[ousmaneo]

Entity tables spread the pluggable extension attributeNames into their defaultDisplayedAttributes, so plugin-contributed columns were shown by default. Drop those names from the default-displayed set on Streams, Event Definitions, Notifications, and Dashboards while keeping them in defaultColumnOrder and the available attributes, so they stay toggleable in the column picker.

/nocl

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have requested a documentation update.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.