Switch from transpile-client-esbuild to transpile-client

The double esbuild processing (transpile + bundle) was causing export
declaration errors. Using TypeScript compiler for transpilation produces
output that's compatible with esbuild bundler.

This fixes errors like:
"ExtHostCommands" is not declared in this file

Co-authored-by: joaomoreno <22350+joaomoreno@users.noreply.github.com>

Author: Copilot

.github/workflows/oss-build-fast.yml

@@ -111,7 +111,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Transpile client & extensions
-        run: npm run gulp transpile-client-esbuild transpile-extensions
+        run: npm run gulp transpile-client transpile-extensions
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
@@ -208,7 +208,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Transpile client & extensions
-        run: npm run gulp transpile-client-esbuild transpile-extensions
+        run: npm run gulp transpile-client transpile-extensions
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
@@ -316,7 +316,7 @@ jobs:
 
       - name: Transpile client & extensions
         shell: pwsh
-        run: npm run gulp transpile-client-esbuild transpile-extensions
+        run: npm run gulp transpile-client transpile-extensions
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}