fix: remove canary config

[VikaCep]

Add Pipeline Dependencies and Fix Configuration

Changes

1. Removed the publish-canary pipeline from .drone.yml
   This pipeline was not being used. According to this, prod-canary is associated to prod-us-central-3 and prod-us-central-4 regions, but Synthetic Monitoring is not deployed there (see here for the list of regions where it's deployed). So removing it from drone made the most sense.

   This PR in the deployment_tools repo removes the explicit overrides in the prod-canary wave file that we had before, so the versions will inherit from the prod wave by default.

2. Fixed configuration overlap by removing prod-canary.libsonnet update from production pipeline, ensuring the production pipeline only manages prod.libsonnet

3. Added Thomas (w1kman) as a reviewer for wave updates.

4. Updated drone signature as required after modifying this file.

Why

• Maintains clear separation of responsibilities between pipelines
• Fixes the new failing check requiring single wave updates (see deployment_tools PR)

[w1kman]

Looks good and most likely is super good.
I just don't know how to verify that it works as intended.

[VikaCep]

While testing the staging promotion, I discovered that the depends_on clause wasn't working as expected. After some investigation, I found that it only works when pipelines are triggered by the same event and target.

We could add some custom validation instead, but in the end I decided to remove this depends_on clause since:

1. It's not critical at this moment
2. We're planning to migrate to GitHub Actions soon
3. The main goal of this PR is to remove the unnecessary canary step from the deployment process

The most important aspect is ensuring that the production pipeline doesn't update the prod-canary.libsonnet file, which would cause the Single wave check to fail.

We will verify that the release process works as expected in the next release but we can be confident that no canary-related processes are being executed after these changes, as it's all been removed from the drone configuration.

[ckbedwell]

LGTM!

...(Please work 😅🤞)