Fixes #17036: Ignore Enter keydown events for IME operation on FeedEditor

[fuzmish]

Describe your changes:

Fixes #17036

• What changes did you make?
  • Ignore Enter keydown events caused by IME operations during CJK text input on KeyDown event handler.
    • Since SyntheticKeyboardEvent does not have .isComposing property, I have used nativeEvent here.
• Why did you make them?
  • See UI issue for Chinese/Japanese/Korean (CJK) text input #17036
• How did you test your changes?
  • I have added test cases to verify the issue is solved by this PR.
  • Also, I have tested the actual UI by running the server locally.

Type of change:

• Bug fix

Checklist:

• 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.
• I have added a test that covers the exact scenario we are fixing. For complex issues, comment the issue number in the test for future reference.

[github-actions]

Hi there 👋 Thanks for your contribution!

The OpenMetadata team will review the PR shortly! Once it has been labeled as safe to test, the CI workflows
will start executing and we'll be able to make sure everything is working as expected.

Let us know if you need any help!

[github-actions]

Phylum OSS Supply Chain Risk Analysis - SUCCESS

The Phylum risk analysis is complete and has passed the active policy.

View this project in the Phylum UI

[github-actions]

Jest test Coverage

UI tests summary

Lines	Statements	Branches	Functions
	65.02% (36710/56460)	41.61% (14531/34921)	43.76% (4462/10196)

[Sachin-chaurasiya]

Great work @fuzmish 🙌🏻,
Thanks for the contributions ✨

[sonarqubecloud]

Quality Gate passed for 'open-metadata-ui'

Issues
1 New issue
0 Accepted issues

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

See analysis details on SonarCloud