D8CORE-8541: Create layout library widget with image icon selection

[pookmish]

NOT READY FOR REVIEW

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Summary

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Criticality

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Review Tasks

Setup tasks and/or behavior to test

1. Check out this branch
2. Rebuild Cache and import config drush cr ; drush ci
3. Navigate to...
4. Verify...

Site Configuration Sync

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Front End Validation

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Backend / Functional Validation

Code

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Code security

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General

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Affected Projects or Products

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Associated Issues and/or People

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Resources

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