pyroscope.scrape: single scrape pool

[korniltsev]

PR Description

This pr changes the pyroscope.scrape manager implementation to only handle one scrapeLook instead of a map of scrapeLoops of size = 1. This simplifies code and removes a goroutine for target sync.

Which issue(s) this PR fixes

Notes to the Reviewer

PR Checklist

• CHANGELOG.md updated
• Documentation added
• Tests updated
• Config converters updated

[Copilot]

PR Overview

This PR refactors the Pyroscope scraping logic to consolidate multiple scrape pools into a single scrape pool. The changes update the Manager to use a unified scrape pool, simplify target group handling in tests and components, and adjust the discovery package accordingly.

• Refactors Manager in manager.go to remove multi-pool support and use a single scrape pool.
• Updates manager_test.go to reflect the new API by switching from map-based target sets to slices.
• Adjusts target group generation and component wiring in target.go and scrape.go for a single-job implementation.

Reviewed Changes

File	Description
internal/component/pyroscope/scrape/manager_test.go	Updates test logic to match the new single scrape pool API and channel type.
internal/component/discovery/target.go	Adds a new helper for generating target groups for a single job and adjusts the return types.
internal/component/pyroscope/scrape/manager.go	Consolidates multi-pool management into a single scrapePool and simplifies related methods.
internal/component/pyroscope/scrape/scrape.go	Updates component initialization and target group generation to use the new single scrape pool design.

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

internal/component/pyroscope/scrape/manager_test.go:22

• Consider checking the error returned by NewManager instead of ignoring it, to catch any initialization issues during testing.

m, _ := NewManager(Options{}, NewDefaultArguments(), pyroscope.AppendableFunc(func(ctx context.Context, labels labels.Labels, samples []*pyroscope.RawSample) error {

[marcsanmi]

LGTM, thanks for this optimization 👍