[jsonnet]: allow overriding the generator workload

[zalegrala]

What this PR does:

Allow overriding the workload for VPA, PDB and SVC on the generator.

Which issue(s) this PR fixes:
Fixes #

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[Copilot]

Pull request overview

This PR updates the Jsonnet microservices deployment for the metrics generator to make the “workload” (controller) referenced by the Service, VPA, and PDB overridable via an overlay, instead of being hard-wired to a specific controller object.

Changes:

• Introduces a hidden tempo_metrics_generator_workload field (defaulting to the generator StatefulSet) and switches Service/VPA/PDB generation to reference it.
• Updates operations/jsonnet-compiled/jsonnetfile.lock.json to newer pinned commits for github.com/grafana/jsonnet-libs.git dependencies.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
operations/jsonnet/microservices/generator.libsonnet	Adds an overridable “workload” reference and uses it for Service/VPA/PDB generation.
operations/jsonnet-compiled/jsonnetfile.lock.json	Bumps pinned commit versions for Jsonnet library dependencies used by the compiled examples.

[Copilot]

Pull request overview

Enables downstream Jsonnet overlays to override which generator controller object is used when generating the Service, Vertical Pod Autoscaler (VPA), and Pod Disruption Budget (PDB) for the metrics-generator microservice.

Changes:

• Introduces a hidden tempo_metrics_generator_workload field as the canonical controller reference for downstream resources.
• Switches the generator Service, VPA, and PDB to reference tempo_metrics_generator_workload instead of hard-coding a specific controller.

[Copilot]

Pull request overview

This PR updates the Tempo Jsonnet microservices generator component to make the “workload” (controller object) that the Service, Vertical Pod Autoscaler (VPA), and Pod Disruption Budget (PDB) are derived from overridable via a single hidden field, enabling downstream overlays/mixins to switch the targeted controller without rewriting those dependent resources.

Changes:

• Add a hidden helper field tempo_metrics_generator_workload:: defaulting to the generator StatefulSet.
• Update generator Service/VPA/PDB generation to reference tempo_metrics_generator_workload instead of a hard-coded controller.