Update helper message when ASPECT_RULES_JS_FROZEN_PNPM_LOCK=true

[Wito-1]

This PR updates the helper message to the user when ASPECT_RULES_JS_FROZEN_PNPM_LOCK=true is set. Under bzlmod the output label to run is the canonical label, however, only includes one @ symbol, so if the user copy/pastes the command it fails to run. This PR tries to rectify it by adding the correct number of @@ symbols prior to the canonical label, eg:

           bazel run @@aspect_rules_js~~npm~npm//:sync

---

Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: no

Test plan

• Manual testing; please provide instructions so we can reproduce:

1. Add update_pnpm_lock = True to e2e/bzlmod/MODULE.bazel

diff --git a/e2e/bzlmod/MODULE.bazel b/e2e/bzlmod/MODULE.bazel
index 9f04be97..bf9a2b8f 100644
--- a/e2e/bzlmod/MODULE.bazel
+++ b/e2e/bzlmod/MODULE.bazel
@@ -39,9 +39,11 @@ npm.npm_translate_lock(
         "less": "npm --version",
         "jasmine": "tsc --version",
     },
+    data = ["//:package.json"],
     npmrc = "//:.npmrc",
     pnpm_lock = "//:pnpm-lock.yaml",
     verify_node_modules_ignored = "//:.bazelignore",
+    update_pnpm_lock = True,
 )
 use_repo(npm, "npm")

2. Modify a dependency in e2e/bzlmod/package.json, eg:

diff --git a/e2e/bzlmod/package.json b/e2e/bzlmod/package.json
index 3a825429..8e783bfc 100644
--- a/e2e/bzlmod/package.json
+++ b/e2e/bzlmod/package.json
@@ -4,7 +4,7 @@
     "dependencies": {
         "chalk": "5.3.0",
         "less": "4.1.3",
-        "jasmine": "5.0.2"
+        "jasmine": "5.0.0"
     },
     "pnpm": {
         "packageExtensions": {

3. Attempt to build in e2e/bzlmod, eg:

$ e2e/bzlmod
$ bazel build --action_env=ASPECT_RULES_JS_FROZEN_PNPM_LOCK=true ...

before the change:

ERROR: `.aspect/rules/external_repository_action_cache/npm_translate_lock_LTE4Nzc1MDcwNjU=` is out of date. `pnpm-lock.yaml` may require an update. To update run,

           bazel run @aspect_rules_js~~npm~npm//:sync

after the change:

ERROR: `.aspect/rules/external_repository_action_cache/npm_translate_lock_LTE4Nzc1MDcwNjU=` is out of date. `pnpm-lock.yaml` may require an update. To update run,

           bazel run @@aspect_rules_js~~npm~npm//:sync

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Buildkite build #8811 is running...

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