git bash prompt running extremely slow

[cpendery]

Does this issue occur when all extensions are disabled?: Yes

Version: 1.90.0-insider (user setup)
Commit: 00bc155
Date: 2024-05-07T05:51:16.352Z
Electron: 28.2.8
ElectronBuildId: 27744544
Chromium: 120.0.6099.291
Node.js: 18.18.2
V8: 12.0.267.19-electron.0
OS: Windows_NT x64 10.0.22631

Steps to Reproduce:

1. Start a git-bash session
2. Run a command
3. Wait, the prompt appears after 2-3 seconds

Details

When running __vsc_report_prompt with __vsc_escape_value, it reports

time __vsc_report_prompt

real    0m1.876s
user    0m0.000s
sys     0m0.000s

versus using __vsc_report_prompt before #211963, which reports

time __vsc_report_prompt

real    0m0.249s
user    0m0.000s
sys     0m0.015s

This is using the prompt

DEFAULT='\[\033[0;0m\]'
CYAN='\[\033[0;36m\]'
MAGENTA='\[\033[0;35m\]'
GREEN='\[\033[0;32m\]'
GIT='`__git_ps1`'
export PS1="${MAGENTA}\u${DEFAULT} \w${CYAN}${GIT}${DEFAULT}\n@ "

[cpendery]

Duplicate of #212090