Revert "Remove (hopefully) unnecessary workflow lines"

[trask]

Reverts #13241

It was a good try, but these are needed when calling a reusable workflow, so may as well keep them all for consistency.

Invalid workflow file: .github/workflows/publish-smoke-test-servlet-images.yml#L88
The workflow is not valid. .github/workflows/publish-smoke-test-servlet-images.yml (Line: 88, Col: 3): Error calling workflow 'open-telemetry/opentelemetry-java-instrumentation/.github/workflows/reusable-workflow-notification.yml@1aea455'. The workflow is requesting 'contents: read', but is only allowed 'contents: none'.

this is my understanding of the issue:

• the non-presence of a permission on the job removes the workflow-level permission (as opposed to being additive)
• since our repos are public, normally you don't need to specify contents: read anyways
• when calling reusable workflows though there appears to be some validation that fails if you haven't specified contents: read on the job that is calling the reusable workflow