ng test does not run tests for all projects

# 🐞 Bug report

### Command (mark with an `x`)

- [ ] new
- [ ] build
- [ ] serve
- [X] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] extract-i18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

### Is this a regression?

Don't know

### Description

The `ng test` documentation states "When a project name is not supplied, it will execute for all projects". However, this does not appear to be true. Only the tests for a single project are run.


## 🔬 Minimal Reproduction

1. Clone https://github.com/swseverance/my-workspace
2. npm install
3. Run `ng test` and observe how only the tests for the app are run. The tests for the lib are not run.

OR

1. Create a workspace
2. Create an app within the workspace
3. Create a lib within the workspace
4. Run `ng test` and observe how only the tests for the app are run. The tests for the lib are not run.

## 🔥 Exception or Error

N/A

## 🌍 Your Environment

Angular CLI: 11.2.14

Node: 14.17.0

OS: darwin x64


Angular: 11.2.14

... animations, cli, common, compiler, compiler-cli, core, forms

... platform-browser, platform-browser-dynamic, router

Ivy Workspace: Yes

Package                         Version

---------------------------------------------------------

@angular-devkit/architect       0.1102.14

@angular-devkit/build-angular   0.1102.14

@angular-devkit/core            11.2.14

@angular-devkit/schematics      11.2.14

@schematics/angular             11.2.14

@schematics/update              0.1102.14

ng-packagr                      11.2.4

rxjs                            6.6.7

typescript                      4.1.6

**Anything else relevant?**

从 `ng test` 命令开始，在链接的 workspace 中，或在包含一个 app 和一个 library 的 workspace 中重现该行为。将文档中描述的所有项目行为与观察到的输出进行比较，然后验证在未提供项目名称时，workspace 中每个项目的测试都会运行。

由索引模型根据 Issue 内容生成。