Use generic workflow discovery in lint-workflows

[github-actions]

Summary

• replace the hand-maintained .github/workflows filename allowlist in make lint-workflows with generic workflow discovery for all top-level workflow YAML files
• keep generated workflow outputs excluded by ignoring *.lock.yml / *.lock.yaml
• preserve linting for claude-workflows/**/example.yml files
• temporarily exclude .github/workflows/agentics-maintenance.yml because it currently contains a pre-existing actionlint syntax error (string should not be empty)

Validation

• make lint-workflows

Resolves #1775.

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What is this? | From workflow: Trigger Framework Best Practices

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[pushkarkurkure172-crypto]

This PR addresses #1775 by migrating the workflow linting process from a manual allowlist to a dynamic, generic discovery model.

Key Updates:

• Replaced the hand-maintained list in make lint-workflows with global workflow discovery.
• Excluded generated output lockfiles (*.lock.yml / *.lock.yaml).
• Maintained coverage for claude-workflows/**/example.yml.
• Temporarily bypassed .github/workflows/agentics-maintenance.yml to prevent failures from a pre-existing empty string syntax error.

Current Status:

• Draft PR awaiting maintainer review and workflow run approval.