Checklist

• I have searched the existing issues for similar issues.
• I added a very descriptive title to this issue.
• I have provided sufficient information below to help reproduce this issue.

Summary

Rendering a code block using st.code() or st.markdown() where the block's first line has leading spaces results in these leading spaces (of the first line only) trimmed.

Reproducible Code Example

import streamlit as st

block = """
    line 1
    line 2
    line 3
"""

st.code(block)
st.markdown(f"```\n{block}\n```")

Steps To Reproduce

1. Paste the above example into a python file (like example.py)
2. Run it with Streamlit (e.g. streamlit run example.py)
3. Point your browser to the URL listed.

Expected Behavior

The code block should render as

    line 1
    line 2
    line 3

Current Behavior

Block is rendered as

line 1
    line 2
    line 3

Is this a regression?

• Not sure.

Debug info

• Streamlit version: 1.20.0
• Python version: 3.10.10
• Operating System: Ubuntu 22.04
• Browser: Firefox 110.0.1
• Virtual environment: poetry 1.3-built