Running the optional angular build migration installs incompatible version of @angular/build

### Command

update

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

Running the optional migration after skipping the build migration during initial update incorrectly installs @angular/build v20 which is not compatible

### Minimal Reproduction

https://github.com/simhnna/angular-build-migration-demo/tree/8971afceeaf60bbe9fff4c9a2777b7711dcb095f

Run `ng update @angular/cli --name=use-application-builder`

```
The installed Angular CLI version is outdated.
Installing a temporary Angular CLI versioned 20.1.0 to perform the update.
Using package manager: npm
Collecting installed dependencies...
Found 22 dependencies.
** Executing 'use-application-builder' of package '@angular/cli' **

❯ Migrate application projects to the new build system.
Application projects that are using the '@angular-devkit/build-angular' package's 'browser' and/or 'browser-esbuild' builders will be migrated to use the new 'application' builder.
You can read more about this, including known issues and limitations, here: https://angular.dev/tools/cli/build-system-migration
The output location of the browser build has been updated from "dist/project" to "dist/project/browser". You might need to adjust your deployment pipeline or, as an alternative, set outputPath.browser to "" in order to maintain the previous functionality.
UPDATE package.json (1032 bytes)
UPDATE angular.json (2749 bytes)
✔ Packages installed successfully.
Migration completed (2 files modified).
```

It installs [`@angular/build@20`](https://github.com/simhnna/angular-build-migration-demo/blob/main/package.json#L26) because it uses @angular/cli@20 to run the update

### Exception or Error

```text

```

### Your Environment

```text
_ _ ____ _ ___
/ \ _ __ __ _ _ _| | __ _ _ __ / ___| | |_ _|
/ △ \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
/ ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
/_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
|___/

Angular CLI: 18.2.20
Node: 22.17.0
Package Manager: npm 10.9.2
OS: linux x64

Angular: 18.2.13
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package Version
---------------------------------------------------------
@angular-devkit/architect 0.1802.20
@angular-devkit/build-angular 18.2.20
@angular-devkit/core 18.2.20
@angular-devkit/schematics 18.2.20
@angular/cli 18.2.20
@schematics/angular 18.2.20
rxjs 7.8.2
typescript 5.4.5
zone.js 0.14.10
```

### Anything else relevant?

_No response_

Start with the `use-application-builder` migration invoked by `ng update @angular/cli --name=use-application-builder`, using the linked reproduction. Inspect the changes to `package.json` and `angular.json` and how the temporary CLI resolves `@angular/build`. Done means the migration installs a version compatible with the project being updated, with tests covering this version-selection case.

Written by the indexing model from the issue text.