Ensure GHA work properly on fork or are disabled!

Signed-off-by: Hilmar Falkenberg <hilmar.falkenberg@sap.com>

Author: hilmarf

.github/workflows/backport.yml

@@ -11,6 +11,7 @@ permissions:
 
 jobs:
   backport:
+    if: github.repository == 'open-telemetry/opentelemetry-java'
     permissions:
       contents: write  # for git push to PR branch
     runs-on: ubuntu-latest

.github/workflows/benchmark-tags.yml

@@ -8,6 +8,7 @@ permissions:
 
 jobs:
   sdk-benchmark:
+    if: github.repository == 'open-telemetry/opentelemetry-java'
     permissions:
       contents: write # for git push to benchmarks branch
     name: Benchmark SDK

.github/workflows/benchmark.yml

@@ -10,6 +10,7 @@ permissions:
 
 jobs:
   sdk-benchmark:
+    if: github.repository == 'open-telemetry/opentelemetry-java'
     permissions:
       contents: write # for git push to benchmarks branch
     name: Benchmark SDK

.github/workflows/build-daily.yml

@@ -14,6 +14,7 @@ jobs:
     uses: ./.github/workflows/reusable-link-check.yml
 
   publish-snapshots:
+    if: github.repository == 'open-telemetry/opentelemetry-java'
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -50,5 +51,5 @@ jobs:
       success: >-
         ${{
           needs.link-check.result == 'success' &&
-          needs.publish-snapshots.result == 'success'
+          (needs.publish-snapshots.result == 'success' || needs.publish-snapshots.result == 'skipped')
         }}