chore(ci): Revert some permission settings

These workflows seemed to break with these permission changes.

.github/workflows/enos-run.yml

@@ -13,9 +13,6 @@ on:
         required: true
         type: string
 
-permissions:
-  contents: read
-
 env:
   PKG_NAME: boundary
 

.github/workflows/security-scan.yml

@@ -7,9 +7,6 @@ on:
     branches:
       - 'main'
 
-permissions:
-  contents: read
-
 jobs:
   scan:
     runs-on: ubuntu-latest