Remove unused GLUE credentials for playwright

[tutte]

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:

• 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.

[Copilot]

Pull request overview

This PR removes unused AWS Glue-related Playwright environment variables from GitHub Actions E2E workflows, reducing secret surface area and workflow configuration noise.

Changes:

• Removed PLAYWRIGHT_GLUE_* env vars from MySQL and PostgreSQL Playwright E2E workflows (including nightly variants).
• Eliminated references to TEST_GLUE_* secrets from these workflows.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
.github/workflows/postgresql-nightly-e2e.yml	Removes unused PLAYWRIGHT_GLUE_* env vars from the nightly Postgres E2E job.
.github/workflows/playwright-postgresql-e2e.yml	Removes unused PLAYWRIGHT_GLUE_* env vars from the on-demand Postgres E2E job.
.github/workflows/playwright-mysql-e2e.yml	Removes unused PLAYWRIGHT_GLUE_* env vars from the on-demand MySQL E2E job.
.github/workflows/mysql-nightly-e2e.yml	Removes unused PLAYWRIGHT_GLUE_* env vars from the nightly MySQL E2E job.

[gitar-bot]

Code Review ✅ Approved

Removes unused GLUE credentials for playwright to reduce security surface area. No issues found.

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