minor: add iframe support in description editor

[Sachin-chaurasiya]

Describe your changes:

Fixes

I worked on ... because ...

Type of change:

• [ ] Bug fix
• [ ] Improvement
• [ ] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation

Checklist:

• [x] I have read the CONTRIBUTING document.
• [ ] My PR title is Fixes <issue-number>: <short explanation>
• [ ] I have commented on my code, particularly in hard-to-understand areas.
• [ ] For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

[github-actions[bot]]

Jest test Coverage

UI tests summary

Lines	Statements	Branches	Functions
	64.11% (37948/59195)	40.72% (15145/37189)	42.89% (4564/10640)

[sonarqubecloud[bot]]

Quality Gate passed for 'open-metadata-ui'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[Sachin-chaurasiya]

Now we are using the block editor, so this is not required anymore.