Release Notes generator is creating new notes incorrectly

[amontanez24]

Environment Details

Please indicate the following details about the environment in which you found the bug:

• SDV version: 0.17.4.dev0 or main branch
• Python version:
• Operating System:

Error Description

The release notes generator is grabbing one extra character before inserting the new notes. An example can be seen in the PR
#2340 . There is an extra '#' being added.

This is because we are adding 1 to the index that we split the text with in the following line

SDV/scripts/release_notes_generator.py

Line 135 in 075cdff

split_index = history.find(token) + len(token) + 1

Steps to reproduce

• Run the prepare release workflow