Switch client to scaleset library for the listener and update mocks

[nikola-jokic]

Start using the scaleset library as a driver for the listener.
Use mockery config instead of //go:generate way.

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[Copilot]

Pull request overview

This PR refactors the listener to use the external scaleset library from https://github.com/actions/scaleset and updates the mock generation strategy from inline //go:generate directives to a centralized .mockery.yaml configuration file.

Changes:

• Migrates from internal actions client to external github.com/actions/scaleset library
• Switches from go:generate mockery directives to .mockery.yaml configuration
• Refactors package structure: renames worker to scaler, removes app package, restructures main.go

Reviewed changes

Copilot reviewed 31 out of 32 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
go.mod, go.sum	Adds scaleset library dependency and updates Go to 1.25.3
.mockery.yaml	Adds centralized mockery configuration for mock generation
github/actions/*.go	Removes //go:generate directives for mocks
github/actions/mocks_test.go	New auto-generated test mocks using mockery
cmd/ghalistener/scaler/	Renamed from worker package, updated to use scaleset library
cmd/ghalistener/main.go	Refactored to directly initialize components instead of using app package
cmd/ghalistener/config/config.go	Updated to use slog logger and scaleset client, renamed RunnerScaleSetId to RunnerScaleSetID
cmd/ghalistener/metrics/	Updated to use slog logger and scaleset types, renamed Publisher to Recorder
cmd/ghalistener/app/	Deleted - functionality moved to main.go
cmd/ghalistener/listener/	Deleted - replaced by scaleset library
controllers/actions.github.com/resourcebuilder.go	Updated field reference from RunnerScaleSetId to RunnerScaleSetID

Comments suppressed due to low confidence (1)

cmd/ghalistener/scaler/scaler.go:246

• Typo in the TODO comment: "MinRunenrs" should be "MinRunners".

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