chore: move Gen-1 API plugin to LTS branch

[phani-srikar]

Description of changes

Removes the following Gen-1 related packages:

• amplify-category-api
• amplify-util-mock
• amplify-dynamodb-simulator
• amplify-graphql-transformer-migrator
• amplify-schema-validator (owned by Console team and used in Gen-1 flows)
• several V1 transformer packages

Bumps the major version for packages common to LTS branch and main including the V2 transformers. The new major version will have active feature development going forward.
Verified that version bumps are as expected:

Test updates:

• Remove the V1 transformer migration tests
• Remove the V1 transformer directives' E2E tests

CI updates:

• Remove the mock-e2e-tests job
• Update the split-e2e-tests script and re-generate the E2E workflow codebuild spec.

Due to the volume of changes, this PR mostly has only package, test deletions which can be seen better from the left-side file navigation view during review. The follow-up PR would have the changes necessary to bump the version of transformer packages common to Gen-1 and CDK/Data constructs.

CDK / CloudFormation Parameters Changed

Issue #, if available

Description of how you validated changes

Full E2E test run passes except following - sql_iam_access, rds_pg_field_auth_userpool_iam, sql_pg_models and RelationalWithAuthV2Redacted. These are due to unrelated test issues like account hitting resource limits. Re-trying and investigating some.

Verified using local publish via verdaccio and consuming the updated package version in amplify-backend repo that I'm able to build and run unit tests.

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)
• New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies
• Any CDK or CloudFormation parameter changes are called out explicitly

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

[sobolk]

The base branch was changed.