feat: add pyroscope http_receive and targets support

[Frostman]

No description provided.

[Copilot]

Pull Request Overview

This PR adds Pyroscope profiling support to the Alloy configuration system, enabling continuous profiling data collection and forwarding to Pyroscope backends.

• Adds PyroscopeTarget type with validation for defining Pyroscope write endpoints
• Implements Pyroscope configuration struct with HTTP receiver settings (address, port)
• Updates the Alloy template to generate pyroscope.write and pyroscope.receive_http blocks

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/alloy/targets.go	Adds PyroscopeTarget type and validation logic for Pyroscope targets
pkg/alloy/config.go	Adds Pyroscope configuration struct with default port constant, removes unused Kube.Validate() method, and applies field alignment
pkg/alloy/config.alloy.tmpl	Adds template blocks for Pyroscope write endpoints and HTTP receiver configuration
pkg/alloy/zz_generated.deepcopy.go	Auto-generated deepcopy methods for new Pyroscope types
pkg/alloy/config_test.go	Adds test coverage for Pyroscope configuration in the full config test case
pkg/alloy/testdata/TestConfigRender_full.expected	Updates expected output with rendered Pyroscope configuration blocks

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