[engsys] Update to latest pnpm 7.x and Rush (Azure#25742)

### Packages impacted by this PR

- All

### Issues associated with this PR

N/A

### Describe the problem that is addressed by this PR

Older versions of pnpm have an [issue with Node
v20](pnpm/pnpm#6424) which can be addressed by
upgrading to `7.32.2` for pnpm and the latest Rush. Note that Rush does
not support `8.x` yet for pnpm.

### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?


### Are there test cases added in this PR? _(If not, why?)_


### Provide a list of related PRs _(if any)_


### Command used to generate this PR:**_(Applicable only to SDK release
request PRs)_

### Checklists
- [x] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [ ] Added a changelog (if necessary)

Author: mpodwysocki

rush.json

@@ -23,7 +23,7 @@
    * Specify one of: "pnpmVersion", "npmVersion", or "yarnVersion".  See the Rush documentation
    * for details about these alternatives.
    */
-  "pnpmVersion": "7.26.0",
+  "pnpmVersion": "7.32.2",
   // "npmVersion": "4.5.0",
   // "yarnVersion": "1.9.4",
   /**
@@ -1984,4 +1984,4 @@
       "versionPolicyName": "management"
     }
   ]
-}
+}