Don't run scheduled GitHub actions on forks (#48693)

Co-authored-by: TypeScript Bot <typescriptbot@microsoft.com>

.github/workflows/codeql.yml

@@ -11,6 +11,7 @@ jobs:
 
     # CodeQL runs on ubuntu-latest and windows-latest
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
 
     steps:
     - name: Checkout repository

.github/workflows/ensure-related-repos-run-crons.yml

@@ -14,6 +14,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
 
     steps:
     - name: Configure git

.github/workflows/nightly.yaml

@@ -11,6 +11,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/twoslash-repros.yaml

@@ -22,6 +22,7 @@ jobs:
   run:
     if: ${{ !github.event.label && !github.event.inputs.bisect_issue }}
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
     steps:
     - name: Use node
       uses: actions/setup-node@v1

.github/workflows/update-package-lock.yaml

@@ -10,6 +10,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
 
     steps:
     - uses: actions/checkout@v2