remove ReportCollator message

[jpserrat]

Closes #6415

Description

Remove unused message ReportCollator and test related to this message on the collator protocol validator side.

cc: @tdimitrov

[tdimitrov]

Could you please remove CollatorId if it is not used anymore? I see a CI job complaining about it.

I can't comment on the exact line - it's 51, the error is shown on the PR (unused import).

[jpserrat]

Done!

[tdimitrov]

Good work @jpserrat! Thank you very much for the contribution.

Before merging we need a PRdoc for the pull request. It's a quick description of the changes in the PR which are used to release notes generation.

To create it add a file named pr_6628.prdoc (the ID of your PR) to the prdoc subdir in the root of the repo. There you need to explain your changes - what you wrote in the PR is more than enough. You can see an example here - https://github.com/paritytech/polkadot-sdk/blob/master/prdoc/pr_5198.prdoc

For your case audience will be Node Dev and you need to list the crates, changed by your PR (polkadot-collator-protocol and polkadot-node-subsystem-types).

[tdimitrov]

Good work @jpserrat

[tdimitrov]

bot fmt

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[command-bot]

@tdimitrov Command "$PIPELINE_SCRIPTS_DIR/commands/fmt/fmt.sh" has finished. Result: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7811730 has finished. If any artifacts were generated, you can download them from https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7811730/artifacts/download.