feat: delete-deployments reusable action

[erikburt]

This creates an official delete-deployments reusable action because:

1. There's a few copies: https://github.com/search?q=org%3Asmartcontractkit+%22.github%2Factions%2Fdelete-deployments%22+path%3A**%2Faction.y*ml&type=code
2. We need to upgrade the deps due to SOC2, but can't easily: [SOC2] Bump delete-deployments deps. chainlink#21269

Changes

• Rewrote general logic into the regular paradigms for typecript actions in this repository
  • Mainly getInvokeContext / getInputs
• Moved github API calls to their own repository
• I had to rebuild signed-commits and changed-modules-go
  • Was getting failures: https://github.com/smartcontractkit/.github/actions/runs/22324711387/job/64592016173
  • Not sure why, but I also had to delete all node_modules, and reinstall everything to actually see changes in the dist.

Testing

Tested locally with scripts/test.sh

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DX-2999

[Copilot]

Pull request overview

Adds an official delete-deployments reusable GitHub Action to consolidate duplicated implementations and modernize dependencies/structure in this repo’s TypeScript action patterns.

Changes:

• Introduces actions/delete-deployments (action.yml, TS sources, Nx project config, scripts, docs, changeset).
• Updates workspace dependencies/lockfile to support new action + Octokit/@actions package upgrades.
• Adds a root clean:deps helper script.

Reviewed changes

Copilot reviewed 14 out of 18 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Adds the new action workspace importer and updates/introduces required @actions/@octokit deps and related lock entries.
package.json	Adds a clean:deps script for removing node_modules across the repo.
apps/go-mod-validator/dist/index.js	Regenerated bundle reflecting updated dependency graph (Octokit core/throttling).
actions/signed-commits/dist/index.js	Regenerated bundle reflecting updated dependency graph (Octokit core/throttling).
actions/delete-deployments/action.yml	Defines the new reusable action interface and runtime entrypoint.
actions/delete-deployments/README.md	Documents inputs and usage example for the new action.
actions/delete-deployments/package.json	Declares dependencies/devDependencies for the new action package.
actions/delete-deployments/project.json	Adds Nx build/check-types targets for the new action.
actions/delete-deployments/tsconfig.json	TypeScript config consistent with other repo actions.
actions/delete-deployments/tsconfig.spec.json	Test TS config (currently no tests wired up).
actions/delete-deployments/src/index.ts	Action entrypoint calling run().
actions/delete-deployments/src/run.ts	Orchestrates input/context parsing, deployment listing, and deletion.
actions/delete-deployments/src/run-inputs.ts	Implements getInputs / getInvokeContext and input parsing helpers.
actions/delete-deployments/src/github.ts	Wraps Octokit initialization and GitHub REST calls for deployments.
actions/delete-deployments/scripts/test.sh	Local manual test harness for the action.
actions/delete-deployments/scripts/payload.json	Sample event payload for local testing.
.changeset/weak-cooks-drive.md	Adds changeset entry for initial delete-deployments release.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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