MINOR - fix(elasticsearch): add None value filter

[AstEfTech]

Describe your changes:

Added None values filter to elasticsearch returned results

Fixes None

Sometimes elasticsearch returns lists with None values in it. To fix this issue we need to filter them out first, befor returning most relevant to the endpoint.

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:

• 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]

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!

[AstEfTech]

None values can be first in the list, that's why we can filter them out before future processing

[TeddyCr]

@AstEfTech you have a few tests failures, once you fix those happy to merge it 😊