Don't send UIA notifications when inserting/deleting text if there is text right from a cursor

[beqabeqa473]

Windows Terminal version

Windows Terminal Preview Version: 1.19.3172.0 Windows Terminal Preview

Windows build number

Version 23H2 (OS Build 22631.2715)

Other Software

NVDA screenreader using command prompt inside windows terminal using UIA notifications to read output

Steps to reproduce

Write some text in terminal;
move the cursor so that the text remains to the right of the cursor;
Try to insert/delete text.

Expected Behavior

Screenreader should not read any text, if character echo is not set to specific value in screenreader itself.

Actual Behavior

NVDA is reading all text right from a cursor, which is a bit disturbing when editing long lines from beginning

[beqabeqa473]

cc @carlos-zamora @codeofdusk @zadjii-msft

[Danstiv]

I can also reproduce this in preview 1.20.10303.0, this is very annoying when editing long commands.