🌱 Remove unnecessary secrets:inherit from 4 reusable workflows (#16094)

These workflows call kubestellar/infra reusable workflows that declare
no secrets inputs and only need the automatic GITHUB_TOKEN. Passing
secrets:inherit exposes all repository secrets unnecessarily.

Signed-off-by: GitHub Copilot <copilot@github.com>
Co-authored-by: GitHub Copilot <copilot@github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people

.github/workflows/add-help-wanted.yml

@@ -10,4 +10,3 @@ permissions:
 jobs:
   label:
     uses: kubestellar/infra/.github/workflows/reusable-add-help-wanted.yml@5c7fdcdde035388fa2df43d860d2372c2dd3e3ed  # main
-    secrets: inherit

.github/workflows/feedback.yml

@@ -11,4 +11,3 @@ permissions:
 jobs:
   feedback:
     uses: kubestellar/infra/.github/workflows/reusable-feedback.yml@5c7fdcdde035388fa2df43d860d2372c2dd3e3ed  # main
-    secrets: inherit

.github/workflows/label-helper.yml

@@ -12,4 +12,3 @@ permissions:
 jobs:
   label-helper:
     uses: kubestellar/infra/.github/workflows/reusable-label-helper.yml@5c7fdcdde035388fa2df43d860d2372c2dd3e3ed  # main
-    secrets: inherit

.github/workflows/stale.yml

@@ -11,4 +11,3 @@ permissions:
 jobs:
   stale:
     uses: kubestellar/infra/.github/workflows/reusable-stale.yml@5c7fdcdde035388fa2df43d860d2372c2dd3e3ed  # main
-    secrets: inherit