[tests-only] correct release PR condition to use build.sender

[prashant-gurung899]

Description

This PR corrects the logic that detects release pull requests by checking ctx.build.sender.

Related Issue

• Part of: Web: Don't run e2e and unit tests on ready-release-go PR qa#47

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)

[Copilot]

Pull request overview

This PR fixes a bug in the Woodpecker CI configuration where the release pull request detection logic was incorrectly checking ctx.build.event twice instead of checking ctx.build.sender to identify PRs from the "openclouders" user.

• Corrects the condition in is_release_pr to properly check ctx.build.sender == "openclouders" instead of the erroneous ctx.build.event == "openclouders"

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