ci: fix cache-related issues (#37761)

Fixes two recurring CI failures:

1. `cache-seeder.yml` lint-backend missing a `make generate-go` before
linting with `TAGS=bindata`, and `pull-compliance.yml` lint-on-demand
failing its post-step pnpm cache save when no pnpm-using conditional
step runs.
2. Drops `cache: pnpm` from lint-on-demand and adds `make generate-go`
to cache-seeder's lint job.

---
This PR was written with the help of Claude Opus 4.7

---------

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>

.github/workflows/cache-seeder.yml

@@ -66,6 +66,9 @@ jobs:
           cache-name: ${{ matrix.job }}
           lint-cache: "true"
       - run: make deps-backend deps-tools
+      - run: make generate-go
+        env:
+          TAGS: ${{ matrix.tags }}
       - run: make ${{ matrix.target }}
         env:
           TAGS: ${{ matrix.tags }}

.github/workflows/pull-compliance.yml

@@ -47,8 +47,6 @@ jobs:
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:
           node-version: 24
-          cache: pnpm
-          cache-dependency-path: pnpm-lock.yaml
 
       - run: make lint-spell