chore: Remove duplicate action/checkout invocations (#15450)

Author: ncooke3

.github/workflows/zip.yml

@@ -194,7 +194,6 @@ jobs:
         run: |
           mkdir -p "${HOME}"/ios_frameworks/
           find "${GITHUB_WORKSPACE}" -name "Firebase*latest.zip" -exec unzip -d "${HOME}"/ios_frameworks/ {} +
-      - uses: actions/checkout@v4
       - name: Check linked Firestore.xcframework for unlinked symbols.
         run: |
           scripts/check_firestore_symbols.sh \
@@ -231,7 +230,6 @@ jobs:
       run: |
         mkdir -p "${HOME}"/ios_frameworks/
         find "${GITHUB_WORKSPACE}" -name "Firebase*latest.zip" -exec unzip -d "${HOME}"/ios_frameworks/ {} +
-    - uses: actions/checkout@v4
     - name: Setup quickstart
       run: SAMPLE="$SDK" TARGET="${SDK}Example" scripts/setup_quickstart_framework.sh \
                                                "${HOME}"/ios_frameworks/Firebase/FirebaseRemoteConfig/* \
@@ -382,7 +380,6 @@ jobs:
       run: |
         mkdir -p "${HOME}"/ios_frameworks/
         find "${GITHUB_WORKSPACE}" -name "Firebase*latest.zip" -exec unzip -d "${HOME}"/ios_frameworks/ {} +
-    - uses: actions/checkout@v4
     - name: Setup quickstart
       run: |
         rm -rf "${HOME}"/ios_frameworks/Firebase/FirebaseAnalytics/FirebaseAnalytics*
@@ -451,7 +448,6 @@ jobs:
       run: |
         mkdir -p "${HOME}"/ios_frameworks/
         find "${GITHUB_WORKSPACE}" -name "Firebase*latest.zip" -exec unzip -d "${HOME}"/ios_frameworks/ {} +
-    - uses: actions/checkout@v4
     - name: Setup quickstart
       run: SAMPLE="$SDK" TARGET="${SDK}Example" NON_FIREBASE_SDKS="FirebaseDatabaseUI" scripts/setup_quickstart_framework.sh \
                                                "${HOME}"/ios_frameworks/Firebase/FirebaseDatabase/* \
@@ -503,7 +499,6 @@ jobs:
       run: |
         mkdir -p "${HOME}"/ios_frameworks/
         find "${GITHUB_WORKSPACE}" -name "Firebase*latest.zip" -exec unzip -d "${HOME}"/ios_frameworks/ {} +
-    - uses: actions/checkout@v4
     - name: Setup quickstart
       run: SAMPLE="$SDK" TARGET="${SDK}Example" NON_FIREBASE_SDKS="SDWebImage FirebaseAuthUI FirebaseEmailAuthUI" scripts/setup_quickstart_framework.sh \
                                                "${HOME}"/ios_frameworks/Firebase/NonFirebaseSDKs/* \
@@ -560,7 +555,6 @@ jobs:
       run: |
         mkdir -p "${HOME}"/ios_frameworks/
         find "${GITHUB_WORKSPACE}" -name "Firebase*latest.zip" -exec unzip -d "${HOME}"/ios_frameworks/ {} +
-    - uses: actions/checkout@v4
     - name: Setup quickstart
       run: SAMPLE="$SDK" TARGET="${SDK}Example" scripts/setup_quickstart_framework.sh \
                                                "${HOME}"/ios_frameworks/Firebase/FirebaseInAppMessaging/* \
@@ -608,7 +602,6 @@ jobs:
       run: |
         mkdir -p "${HOME}"/ios_frameworks/
         find "${GITHUB_WORKSPACE}" -name "Firebase*latest.zip" -exec unzip -d "${HOME}"/ios_frameworks/ {} +
-    - uses: actions/checkout@v4
     - name: Setup quickstart
       run: SAMPLE="$SDK" TARGET="${SDK}Example" scripts/setup_quickstart_framework.sh \
                                                "${HOME}"/ios_frameworks/Firebase/FirebaseMessaging/* \
@@ -656,7 +649,6 @@ jobs:
       run: |
         mkdir -p "${HOME}"/ios_frameworks/
         find "${GITHUB_WORKSPACE}" -name "Firebase*latest.zip" -exec unzip -d "${HOME}"/ios_frameworks/ {} +
-    - uses: actions/checkout@v4
     - name: Setup quickstart
       run: SAMPLE="$SDK" TARGET="${SDK}Example" scripts/setup_quickstart_framework.sh \
                                                "${HOME}"/ios_frameworks/Firebase/FirebaseStorage/* \