bug(MatInputHarness): Does not properly set negative value with <input type="number">

[hnuttin]

Reproduction

https://stackblitz.com/edit/mat-input-harness-negative-issue

Is this related to #18812 ?

Steps to reproduce:

1. use an html <input type="number">
2. set a negative value using the MatInputHarness.setValue('-2')
3. check the value using MatInputHarness.getValue()
4. this value will be positive '2'

Expected Behavior

Value should be set to negative number

Actual Behavior

The value has a positive value

Environment

• Angular: 9.1.6
• CDK/Material: 9.1.6
• Browser(s): Chrome 81.0.4044.113
• Operating System (e.g. Windows, macOS, Ubuntu): macOS 10.15.4

[crisbeto]

We decided to rework #18812 and go forward with it. Closing as a duplicate of #18790.

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