Group Renovate minor updates and schedule majors weekly

[trask]

Renovate opens a separate pull request for every non-OpenTelemetry minor update, because the config groups only patch and digest updates. That produced 56 individual pull requests out of 85 in the last 90 days. org.mock-server:mockserver-netty alone took 9 of them to go from v6 to v7.5.

Minor updates now fold into the weekly group, and majors move to the same weekly schedule, so they still arrive individually but only once a week.

OpenTelemetry updates are excluded from both rules and keep landing immediately and individually, so dogfooding and cascaded releases are unchanged. The exclusion now also covers open-telemetry/**, the GitHub tag that logging-k8s-stdout-otlp-json tracks.

The otel/opentelemetry-collector-contrib and grafana/otel-lgtm images do join the weekly group. That is deliberate, since they are test infrastructure rather than cascaded releases.

[Copilot]

Pull request overview

Updates the repository’s Renovate configuration to reduce PR noise by grouping non-OpenTelemetry minor updates into the existing weekly group, and by scheduling major updates to only be created/updated during the weekly window while still remaining individual PRs.

Changes:

• Expand the weekly grouped updates rule to include minor update types (in addition to patch and digest).
• Add a weekly scheduling rule for major updates (while keeping them ungrouped/individual).
• Extend the “do not include in weekly rules” exclusions to cover both io.opentelemetry** coordinates and open-telemetry/** GitHub tag dependencies.

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