ci: Remove unhelpful check for secret in auto_merge_prs.yml

[Pr0methean]

Fails spuriously, apparently because secrets aren't substituted into script body.

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[amazon-q-developer]

The removal of the secret validation check is correct. GitHub Actions doesn't substitute secrets into shell script bodies for security reasons, making the removed check fundamentally flawed—it would always see an empty string regardless of whether the secret is configured. The secret is properly used on line 21 where it's passed directly to the action's with: parameter, which is the correct approach. If the secret is missing, the create-github-app-token action will fail with an appropriate error message, providing the same safeguard without spurious failures.

The PR title correctly follows the Conventional Commits format with the ci: prefix as required by the guidelines.

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