fix(e2e): clean up allure report code

Description

Fix allure report flakiness by extending the timeout and not failing the job if the report is not generated.

Related Issues

Resolves #1345 (closed)

How has this been tested?

https://gitlab.com/gitlab-org/gitlab-vscode-extension/-/jobs/7027017503

Screenshots (if appropriate)

What CHANGELOG entry will this MR create?

• fix: Bug fix fixes - a user-facing issue in production - included in changelog
• feature: New feature - a user-facing change which adds functionality - included in changelog
• BREAKING CHANGE: (fix or feature that would cause existing functionality to change) - should bump major version, mentioned in the changelog
• None - other non-user-facing changes