ci: expose suite option, use exhaustive for cron

[trevorwhitney]

What this PR does / why we need it:

• Exposes a suite option to manual dispatches of the LogQL Correctness job
• Makes the cron job use the exhaustive suite

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[Copilot]

Pull request overview

This PR updates the LogQL correctness GitHub Actions workflow to let manually-triggered runs select a test suite, and ensures scheduled (cron) runs execute the most comprehensive suite.

Changes:

• Adds a suite choice input to workflow_dispatch with fast, regression, and exhaustive options.
• Updates the test runner step to compute a SUITE regex based on the selected suite.
• Makes scheduled runs default to the exhaustive suite while keeping other triggers defaulting to regression.

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