Support Multi-line Upcoming Breaking Change announcement

[ReaNAiveD]

• Support Multi-line Upcoming Breaking Change announcement
• Bugfix in multi-version report

[Copilot]

Pull Request Overview

This PR adds support for multi-line upcoming breaking change announcements and includes a bugfix for the multi-version report.

• Updated the package version in azdev/init.py
• Added a new "prepended_detail" property and updated its usage in azdev/operations/breaking_change/init.py to format multi-line details

Reviewed Changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

File	Description
azdev/init.py	Bumped version from 0.1.99 to 0.1.100
azdev/operations/breaking_change/init.py	Introduced a new property for formatting multi-line breaking change details and updated its usage in grouping items

Files not reviewed (2)

• HISTORY.rst: Language not supported
• azdev/operations/breaking_change/markdown_template.jinja2: Language not supported

Comments suppressed due to low confidence (1)

azdev/operations/breaking_change/init.py:41

• [nitpick] The current list comprehension includes empty strings for any blank lines in 'self.detail', which may lead to unnecessary blank entries in the output. Consider filtering out empty lines to produce a cleaner concatenated result.

prepended_lines = [f'- {l}' if l else '' for l in self.detail.split('\n')]