[ci-bitrise] Drop manage-ios-code-signing — can't parse this multi-platform target

Fails with 'no PLATFORM_DISPLAY_NAME config found for (PediFoods App)
target'. SUPPORTED_PLATFORMS = iphoneos iphonesimulator macosx on this
target (Skip's build) makes the step's platform detection ambiguous.
xcode-archive@5's own automatic_code_signing: api-key already handles
signing, so the step was redundant on top of being broken here.

bitrise.yml

@@ -105,13 +105,6 @@ workflows:
             - content: |
                 cd $BITRISE_SOURCE_DIR/Darwin
                 agvtool new-version -all $BITRISE_BUILD_NUMBER
-      - manage-ios-code-signing@2:
-          inputs:
-            - distribution_method: app-store
-            - project_path: $BITRISE_PROJECT_PATH
-            - scheme: $BITRISE_SCHEME
-            # MANUAL: Upload .p12 cert + .mobileprovision in
-            # Bitrise → Code Signing tab BEFORE running this workflow
       - xcode-archive@5:
           inputs:
             - project_path: $BITRISE_PROJECT_PATH
@@ -155,11 +148,6 @@ workflows:
             - content: |
                 cd $BITRISE_SOURCE_DIR/Darwin
                 agvtool new-version -all $BITRISE_BUILD_NUMBER
-      - manage-ios-code-signing@2:
-          inputs:
-            - distribution_method: app-store
-            - project_path: $BITRISE_PROJECT_PATH
-            - scheme: $BITRISE_SCHEME
       - xcode-archive@5:
           inputs:
             - project_path: $BITRISE_PROJECT_PATH