Remove inadvertent lerna "conventional commit" CHANGELOG changes.

This was inadvertently (and surprisingly) applied via a test on the
`release-2.13.0` branch during an alpha release (e8266d6, specifically).

The `--conventional-commits` flag did what I'd hoped, but it should have
`--no-changelog` attached to it as well to prevent this, since we currently
manage these Changelogs differently.

I'm intrigued by moving toward another approach here, but I want to stop
short of purely automated changelogs which don't provide as much value as I
think the manually curated ones we currently offer do.

Author: abernix

packages/apollo-cache-control/CHANGELOG.md

@@ -1,16 +1,3 @@
-# Change Log
-
-All notable changes to this project will be documented in this file.
-See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
-
-# [0.10.0-alpha.0](https://github.com/apollographql/apollo-cache-control-js/compare/apollo-cache-control@0.9.1...apollo-cache-control@0.10.0-alpha.0) (2020-04-10)
-
-**Note:** Version bump only for package apollo-cache-control
-
-
-
-
-
 # Changelog
 
 > **A note on ommitted versions**: Due to the way that the Apollo Server

packages/apollo-datasource-rest/CHANGELOG.md

@@ -1,16 +1,3 @@
-# Change Log
-
-All notable changes to this project will be documented in this file.
-See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
-
-# [1.8.0-alpha.0](https://github.com/apollographql/apollo-engine-reporting/compare/apollo-engine-reporting@1.7.1...apollo-engine-reporting@1.8.0-alpha.0) (2020-04-10)
-
-**Note:** Version bump only for package apollo-engine-reporting
-
-
-
-
-
 ### vNext
 
 # v1.0.0
@@ -20,3 +7,4 @@ See [Conventional Commits](https://conventionalcommits.org) for commit guideline
   moved to the `apollo-graphql` package.  They should be more universally
   helpful in that library, and should avoid tooling which needs to use them
   from needing to bring in all of `apollo-server-core`.
+

packages/apollo-engine-reporting-protobuf/CHANGELOG.md

@@ -1,16 +1,3 @@
-# Change Log
-
-All notable changes to this project will be documented in this file.
-See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
-
-# [2.13.0-alpha.0](https://github.com/apollographql/apollo-server/tree/master/packages/apollo-server-core/compare/apollo-server-core@2.12.0...apollo-server-core@2.13.0-alpha.0) (2020-04-10)
-
-**Note:** Version bump only for package apollo-server-core
-
-
-
-
-
 # Changelog
 
 ### vNEXT