Issue number: Internal
---------
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## What is the new behavior?
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- v7 breaking changes moved to legacy file.
- New v8 section added to main breaking changes list.
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
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and migration path for existing applications below. -->
## Other information
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## What is the current behavior?
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Breaking changes for v6 and v7 are in the same file
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## What is the new behavior?
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this PR. -->
- Breaking changes for v6 are in their own file
- BREAKING.md only includes breaking changes for v7
- BREAKING.md links to breaking changes for v6
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
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and migration path for existing applications below. -->
## Other information
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