[Foundry extensions] remove unnecessary approval workflows

[trangevi]

Fixes #8484

[github-actions]

📋 Prioritization Note

Thanks for the contribution! The linked issue isn't in the current milestone yet.
Review may take a bit longer — reach out to @rajeshkamal5050 or @kristenwomack if you'd like to discuss prioritization.

[Copilot]

Pull request overview

Removes the per-extension required-approval GitHub Actions workflows for the Foundry-family azd extensions and folds the previously workflow-only approver lists into CODEOWNERS, so review enforcement is driven solely by GitHub's native code-owner approvals.

Changes:

• Deletes seven approval-ext-azure-ai-*.yml workflows (agents, connections, inspector, projects, routines, skills, toolboxes).
• Adds @glharper to the Foundry-related extension entries in CODEOWNERS, and adds the inspector-specific approvers (@anchenyi @XiaofuHuang @swatDong) to the inspector entry.
• Drops @huimiu from the azure.ai.projects CODEOWNERS entry (appears unrelated to the stated PR purpose).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.github/workflows/approval-ext-azure-ai-agents.yml	Deleted approval gate workflow.
.github/workflows/approval-ext-azure-ai-connections.yml	Deleted approval gate workflow.
.github/workflows/approval-ext-azure-ai-inspector.yml	Deleted approval gate workflow (carried extra approver list).
.github/workflows/approval-ext-azure-ai-projects.yml	Deleted approval gate workflow.
.github/workflows/approval-ext-azure-ai-routines.yml	Deleted approval gate workflow.
.github/workflows/approval-ext-azure-ai-skills.yml	Deleted approval gate workflow.
.github/workflows/approval-ext-azure-ai-toolboxes.yml	Deleted approval gate workflow.
.github/CODEOWNERS	Adds @glharper (and inspector-specific reviewers) to Foundry extension ownership; removes @huimiu from projects.

Additional notes (outside the diff):

• .github/scripts/pr-approval-foundry-extensions-shared.js is now orphaned — no remaining workflow references it. Consider removing it as a follow-up.
• .github/skills/tool-version-upgrade/SKILL.md still cites approval-ext-azure-ai-agents.yml as an example of a supply-chain-hardened workflow; that reference is now stale.

[JeffreyCA]

There's a validation error at https://github.com/Azure/azure-dev/blob/trangevi/remove-foundry-workflows/.github/CODEOWNERS

May need to check @swatDong has proper access to the repo