fix(lambda-nodejs): pnpm installs frozen lockfile in a CI environment (#24781)

[pnpm automatically enables `--frozen-lockfile` in CI environments](https://pnpm.io/cli/install#--frozen-lockfile) which breaks `NodejsFunction` local bundling.

This change appends the `--no-prefer-frozen-lockfile` flag as described in pnpm/pnpm#1994 (comment)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: Tucker-Eric

Diff for: packages/@aws-cdk/aws-lambda-nodejs/lib/package-manager.ts

@@ -39,9 +39,10 @@ export class PackageManager {
       case LockFile.PNPM:
         return new PackageManager({
           lockFile: LockFile.PNPM,
-          installCommand: logLevel && logLevel !== LogLevel.INFO ? ['pnpm', 'install', '--reporter', 'silent', '--config.node-linker=hoisted', '--config.package-import-method=clone-or-copy'] : ['pnpm', 'install', '--config.node-linker=hoisted', '--config.package-import-method=clone-or-copy'],
+          installCommand: logLevel && logLevel !== LogLevel.INFO ? ['pnpm', 'install', '--reporter', 'silent', '--config.node-linker=hoisted', '--config.package-import-method=clone-or-copy', '--no-prefer-frozen-lockfile'] : ['pnpm', 'install', '--config.node-linker=hoisted', '--config.package-import-method=clone-or-copy', '--no-prefer-frozen-lockfile'],
           // --config.node-linker=hoisted to create flat node_modules without symlinks
           // --config.package-import-method=clone-or-copy to avoid hardlinking packages from the store
+          // --no-prefer-frozen-lockfile (works the same as yarn's --no-immutable) Disable --frozen-lockfile that is enabled by default in CI environments (https://github.com/pnpm/pnpm/issues/1994).
           runCommand: ['pnpm', 'exec'],
           argsSeparator: '--',
         });

Diff for: packages/@aws-cdk/aws-lambda-nodejs/test/bundling.test.ts

@@ -433,7 +433,7 @@ test('Detects pnpm-lock.yaml', () => {
     assetHashType: AssetHashType.OUTPUT,
     bundling: expect.objectContaining({
       command: expect.arrayContaining([
-        expect.stringMatching(/echo '' > "\/asset-output\/pnpm-workspace.yaml\".+pnpm-lock\.yaml.+pnpm install --config.node-linker=hoisted --config.package-import-method=clone-or-copy && rm "\/asset-output\/node_modules\/.modules.yaml"/),
+        expect.stringMatching(/echo '' > "\/asset-output\/pnpm-workspace.yaml\".+pnpm-lock\.yaml.+pnpm install --config.node-linker=hoisted --config.package-import-method=clone-or-copy --no-prefer-frozen-lockfile && rm "\/asset-output\/node_modules\/.modules.yaml"/),
       ]),
     }),
   });

Diff for: packages/@aws-cdk/aws-lambda-nodejs/test/package-manager.test.ts

@@ -37,15 +37,15 @@ test('from a pnpm-lock.yaml', () => {
   const packageManager = PackageManager.fromLockFile('/path/to/pnpm-lock.yaml');
   expect(packageManager.lockFile).toEqual(LockFile.PNPM);
   expect(packageManager.argsSeparator).toEqual('--');
-  expect(packageManager.installCommand).toEqual(['pnpm', 'install', '--config.node-linker=hoisted', '--config.package-import-method=clone-or-copy']);
+  expect(packageManager.installCommand).toEqual(['pnpm', 'install', '--config.node-linker=hoisted', '--config.package-import-method=clone-or-copy', '--no-prefer-frozen-lockfile']);
   expect(packageManager.runCommand).toEqual(['pnpm', 'exec']);
 
   expect(packageManager.runBinCommand('my-bin')).toBe('pnpm exec -- my-bin');
 });
 
 test('from a pnpm-lock.yaml with LogLevel.ERROR', () => {
   const packageManager = PackageManager.fromLockFile('/path/to/pnpm-lock.yaml', LogLevel.ERROR);
-  expect(packageManager.installCommand).toEqual(['pnpm', 'install', '--reporter', 'silent', '--config.node-linker=hoisted', '--config.package-import-method=clone-or-copy']);
+  expect(packageManager.installCommand).toEqual(['pnpm', 'install', '--reporter', 'silent', '--config.node-linker=hoisted', '--config.package-import-method=clone-or-copy', '--no-prefer-frozen-lockfile']);
 });
 
 test('defaults to NPM', () => {