Always regenerate SDK client on application install and upgrade (#24696)

## Context

The generated SDK client (per workspace, per app) was only regenerated
on first install or when the app's metadata schema changed
(`isFirstApply || hasSchemaMetadataChanged` in
`ApplicationManifestApplyService`). Function-only app upgrades never
triggered a regeneration, so a workspace could keep a client generated
against an old SDK version forever and miss SDK-level additions like
`enqueueJob`. This is what broke Last Contact on cloud: the workspace's
client was generated on SDK 2.25 (pre `enqueueJob`) and every 1.2.x
upgrade was function-only, so it stayed frozen until a reinstall forced
a regen.

## What this does

- `applyManifestToWorkspace` now always regenerates the SDK client after
a manifest sync by default, so marketplace/tarball installs and upgrades
(including auto-upgrades) always pick up SDK-level changes.
- CLI dev sync opts into the previous behavior via
`shouldOnlyGenerateSdkClientOnSchemaChange: true`, keeping the
schema-change optimization so the client is not regenerated on every
file save.
- Adds unit tests for `ApplicationManifestApplyService` covering both
paths (install/upgrade always regenerates; dev sync skips when the
schema is unchanged, regenerates on first apply or schema change).

## Test

`npx jest
packages/twenty-server/src/engine/core-modules/application/application-manifest/__tests__/application-manifest-apply.service.spec.ts`
passes; server typecheck and diff lint clean.

---
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