chore: remove continue-on-error from HACS validation

Remove `continue-on-error: true` from the HACS validation step in both
`ci.yml` and `manual-validation.yml`. This change ensures that any
failures during HACS validation will prevent the workflow from
proceeding, thus highlighting issues early and maintaining stricter
data integrity during continuous integration and manual validation
processes.

Author: DefinitelyADev

.github/workflows/ci.yml

@@ -88,7 +88,6 @@ jobs:
       uses: hacs/action@main
       with:
         category: integration
-      continue-on-error: true
 
   hassfest:
     runs-on: ubuntu-latest

.github/workflows/manual-validation.yml

@@ -113,4 +113,3 @@ jobs:
       uses: hacs/action@main
       with:
         category: integration
-      continue-on-error: true