Fix the try build when pushing to branches (#30903)

Make it so that all try builds go through try.yml and pass
workflow_call arguments as expected to subsequent workflows.

Co-authored-by: Samson <16504129+sagudev@users.noreply.github.com>

.github/workflows/mac.yml

@@ -40,8 +40,6 @@ on:
         required: false
         default: false
         type: boolean
-  push:
-    branches: ["try-mac", "try-wpt-mac", "try-wpt-mac-2020"]
 
 env:
   RUST_BACKTRACE: 1
@@ -97,7 +95,7 @@ jobs:
       - name: Script tests
         run: ./mach test-scripts
       - name: Unit tests
-        if: ${{ inputs.unit-tests || github.ref_name == 'try-mac' }}
+        if: ${{ inputs.unit-tests }}
         uses: nick-fields/retry@v2
         with:
           timeout_minutes: 20 # https://github.com/servo/servo/issues/30275
@@ -143,7 +141,7 @@ jobs:
           path: target.tar.gz
 
   wpt-2020:
-    if: ${{ github.ref_name == 'try-wpt-mac-2020' || inputs.wpt-layout == '2020' || inputs.wpt-layout == 'all' }}
+    if: ${{ inputs.wpt-layout == '2020' || inputs.wpt-layout == 'all' }}
     name: Mac WPT Tests 2020
     needs: ["build"]
     uses: ./.github/workflows/mac-wpt.yml
@@ -153,7 +151,7 @@ jobs:
     secrets: inherit
 
   wpt-2013:
-    if: ${{ github.ref_name == 'try-wpt-mac' || inputs.wpt-layout == '2013' || inputs.wpt-layout == 'all' }}
+    if: ${{ inputs.wpt-layout == '2013' || inputs.wpt-layout == 'all' }}
     name: Mac WPT Tests 2013
     needs: ["build"]
     uses: ./.github/workflows/mac-wpt.yml