chore: add publication-date to helix-query.yaml

[asthabh23]

Description

This PR adds publication-date to helix-query.yaml to index this field for blog posts

Related Issue

#731

Motivation and Context

This will be helpful for filtering blogs on blog listing page

Types of changes

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

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

https://main--helix-website--adobe.aem.page/blog/aem-live-at-dev-live
vs
https://issue-731--helix-website--adobe.aem.page/blog/aem-live-at-dev-live

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
• Re-sync branch

Commits

• 9de3b0a ✅ (latest)

[aem-code-sync]

	Page	Scores	Audits	Google
📱	/blog/aem-live-at-dev-live
🖥️	/blog/aem-live-at-dev-live