Add workflow_dispatch trigger to all workflows

[Copilot]

GitHub paused scheduled/inactive workflows on this repo, blocking security PRs from running required checks. Adding workflow_dispatch to all workflows allows manual re-triggering to unblock those runs.

Changes

• code-ql.yml – added workflow_dispatch alongside existing push, pull_request, and schedule triggers
• auto-merge-dependabot.yml – added workflow_dispatch alongside existing pull_request trigger
• conflicting-pr-label.yml – added workflow_dispatch alongside existing push and pull_request triggers

ruby.yml and release.yml already had workflow_dispatch and are unchanged.

Original prompt

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This section details on the original issue you should resolve

<issue_title>update all workflows to accept a workflow dispath trigger</issue_title>
<issue_description>some workflows got paused due to repository inactivity, and we need to manually queue runs to unblock security PRs</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes update all workflows to accept a workflow dispath trigger #54

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