chore: improve no rules found message [DX-5105]

[Tofel]

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📊 API Diff Results

No changes detected for module github.com/smartcontractkit/chainlink-testing-framework/grafana-alertcheck

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[Copilot]

Copilot review overview

🟡 Changes recommended

The CLI documentation contradicts itself about whether datasource-managed rules can produce a kind-specific refusal.

Review effort: Balanced
Findings: 1

Open (1)

• Clarify datasource-managed versus recording rule endpoint behavior · New

What changed in this PR

Improves no-match diagnostics by clarifying which Grafana alert rules are visible and supported.

Changes:

• Scopes available-rule counts to Grafana-managed rules.
• Adds a datasource-managed-rule limitation notice.
• Updates tests, documentation, and release notes.

File	Description
grafana-alertcheck/​internal/​gate/​resolve.go	Enhances no-match errors.
grafana-alertcheck/​internal/​gate/​resolve_test.go	Verifies updated diagnostics.
grafana-alertcheck/​docs/​reference/​cli.md	Documents no-match behavior.
grafana-alertcheck/​.changeset/​v0.1.6.md	Adds the release note.

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