`@aws-amplify/backend` should inherit version bump of same kind from dependencies

Problem

@aws-amplify/backend sometimes does not properly inherit the right kind of version bump from its dependencies.

refactored check_changeset_completeness.ts to be split into functions
added set of functions to check_changeset_completeness.ts that check whether backend should be inheriting a version bump and whether it is currently inheriting the right kind of version bump Corresponding docs PR, if applicable:

ran manual tests using different version bumps for backend and its dependencies
Test 1: backend: none, dependencies have version bump of minor
Test 2: backend: minor, dependencies are minor or none
Test 3: backend: patch, dependencies are minor or patch
Test 4: backend: patch, no dependency versions
Test 5: backend: minor, one dependency is major

[ ] If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
[ ] If this PR requires a change to the Project Architecture README, I have included that update in this PR.
[ ] If this PR requires a docs update, I have linked to that docs PR above.
[ ] If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.