TPT-4160: Add Listing ACLP Alert Channels Data Source

[yec-akamai]

📝 Description

Add a data source for listing ACLP alert channels.

✔️ How to Test

make test-unit

make test-int PKG_NAME=monitoralertchannels 

[Copilot]

Pull request overview

This PR adds a new Terraform Plugin Framework data source, linode_monitor_alert_channels, to list Linode Monitor Alert notification channels (with optional filtering), along with tests, templates, documentation, and provider registration. It also updates module dependencies to pick up the required Linodego API support.

Changes:

• Implement linode_monitor_alert_channels framework data source (schema, models/flattening, read/list logic).
• Add unit + integration tests and acceptance templates for basic and filtered queries.
• Register the data source in the framework provider and add user documentation; update Go/dependencies (incl. Linodego).

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
linode/monitoralertchannels/framework_datasource.go	Data source Read implementation and API listing function
linode/monitoralertchannels/framework_schema_datasource.go	Data source schema + filterable fields configuration
linode/monitoralertchannels/framework_models.go	Terraform state models and API→state flattening helpers
linode/monitoralertchannels/framework_models_test.go	Unit tests for flattening/model parsing
linode/monitoralertchannels/datasource_test.go	Integration test coverage for basic + filtered queries
linode/monitoralertchannels/tmpl/template.go	Acceptance test template helpers
linode/monitoralertchannels/tmpl/data_basic.gotf	HCL template for basic data source config
linode/monitoralertchannels/tmpl/data_filter.gotf	HCL template for filtered data source config
linode/framework_provider.go	Registers the new data source with the framework provider
docs/data-sources/monitor_alert_channels.md	Adds end-user docs for the new data source
go.mod	Updates Go version/deps; adds Linodego override
go.sum	Dependency checksum updates corresponding to go.mod changes

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[zliang-akamai]

LGTM!

[psnoch-akamai]

All good for me. Tests work locally