refactor(cli): drop --build-only / --register-only modes

The two-phase deploy machinery added in 8f98ebb has been replaced with two
~150-line driver scripts living next to the GovSignals tasks Dockerfile,
which import build/deploy primitives via the new `trigger.dev/internal`
subpath export instead of going through the CLI binary. None of the CLI
flags or helper functions are reachable any more.

Removed:

- buildOnlyDeploy (~170 lines) and registerOnlyDeploy (~340 lines)
- CLI options --build-only, --register-only, --registry, --repository,
  --containerfile-module
- Zod schema fields buildOnly, registerOnly, registry, repository,
  containerfileModule
- Early-return shims at the top of _deployCommand
- The containerfileModule passthrough in _deployCommand's buildWorker call
  (the option is gone; buildWorker still accepts the parameter for callers
  using `trigger.dev/internal` directly)
- init.ts changes that taught `trigger init` to add `.triggerdeploy.json`
  to the project .gitignore
- Root .gitignore entry for .triggerdeploy.json

What stays:

- managed-index-controller.ts offline-mode bootstrap (TRIGGER_INDEX_OFFLINE=1
  env var) — still needed by the offline indexer that runs inside the build
  container
- buildImage.ts offlineIndex option, generateContainerfile, parseGenerateOptions
- buildWorker.ts containerfileModule plumbing (now consumed via
  `trigger.dev/internal`)
- All supervisor / helm / webapp fork patches

Net: -520 lines.
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: ConProgramming

.gitignore

@@ -55,7 +55,6 @@ apps/**/public/build
 
 .cosine
 .trigger
-.triggerdeploy.json
 .tshy*
 .yarn
 *.tsbuildinfo