Remove unused use-hermes-nightly input from prebuild-ios-core

The Hermes version is now derived from version.properties directly,
so the use-hermes-nightly input and all caller references are no
longer needed.

Author: cipolleschi

.github/workflows/nightly.yml

@@ -29,7 +29,6 @@ jobs:
   prebuild_react_native_core:
     uses: ./.github/workflows/prebuild-ios-core.yml
     with:
-      use-hermes-nightly: true
       version-type: nightly
     secrets: inherit
     needs: [prebuild_apple_dependencies]

.github/workflows/prebuild-ios-core.yml

@@ -8,11 +8,6 @@ on:
         type: string
         required: false
         default: ''
-      use-hermes-nightly:
-        description: 'Whether to use the hermes nightly build or read the version from the versions.properties file'
-        type: boolean
-        required: false
-        default: false
 
 jobs:
   build-rn-slice:

.github/workflows/test-all.yml

@@ -96,8 +96,6 @@ jobs:
 
   prebuild_react_native_core:
     uses: ./.github/workflows/prebuild-ios-core.yml
-    with:
-      use-hermes-nightly: ${{ !endsWith(github.ref_name, '-stable') }}
     secrets: inherit
     needs: [prebuild_apple_dependencies]