`<Esc>` after creation of a new auto-indented line in insert mode does not remove whitespace

Describe the bug

While typing text in insert mode with the Auto Indent setting enabled, Esc immediately following the creation of a new auto-indented line (via Enter/Return) will leave behind whitespace.

With Vim, all such whitespace is removed as soon as Esc is hit, leaving only a blank line.

To Reproduce

While in insert mode with the Auto Indent setting enabled, type the following:

this
<tab>is
a
test
<esc>

Expected behavior

Vim result:

this
    is
    a
    test
|

Unexpected VSCodeVim result:

this
    is
    a
    test
   |

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.0.8
• VSCode version: 1.31.1
• OS: Windows 10 x64 10.0.17763

Additional context

Behavior appears to be correct with regard to new lines created via O or o, but not with regard to basic text entry while in insert mode.

Related to issue: #2693

Reproduce the insert-mode case with Auto Indent enabled, pressing Enter and then Esc, and compare it with the working O and o cases. Trace the Enter and Esc handling in the VSCodeVim extension; done means Esc removes the newly created line's indentation as Vim does.