Removing things we don't need

[daron-schmit-gaggle]

Because this is supposed to be a short-lived fork, I have removed everything that we don't immediately need. Eventually, we may want to consider running actual tests, but hopefully the fixes we need will be merged soon and we can bin this repository.

The only meaningful changes are

• packages/plugins/typescript/apollo-angular/src/visitor.ts which comes from this PR in the main library fix(typescript-apollo-angular): support apollo-angular v12+ combined parameter syntax dotansimha/graphql-code-generator-community#1355
• package-lock.json (adding publish yarn commands)
• tsconfig.json (removing references to plugins we don't use)

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Note

Medium Risk
Moderate risk: removes GitHub Actions workflows/templates and prunes dev-test outputs, which can reduce CI coverage and change release tooling behavior. Also adjusts typescript-apollo-angular codegen output (v12+ option typing/overrides), which could affect generated client APIs.

Overview
Strips the repo down for a short-lived fork by deleting GitHub PR/CI/release workflows and removing a large set of dev-test generation targets and their checked-in outputs, leaving only the apollo-angular dev-test artifacts.

Updates Changesets configuration by switching to the default @changesets/cli changelog and adding a pre.json for the alpha prerelease track.

Includes a behavioral change in packages/plugins/typescript/apollo-angular generation (notably around v12+ SDK/options typing and override emission via addExplicitOverride).

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