Remove Partners client selection

[isaacroldan]

What

Remove the remaining Partners client selection path and use App Management as the default developer platform client.

Testing

• pnpm test packages/app/src/cli/commands/app/init.test.ts packages/app/src/cli/services/context.test.ts packages/app/src/cli/services/dev/fetch.test.ts packages/app/src/cli/services/app/config/link-service.test.ts packages/cli-kit/src/public/node/api/partners.test.ts

[github-actions]

Differences in type declarations

We detected differences in the type declarations generated by Typescript for this branch compared to the baseline ('main' branch). Please, review them to ensure they are backward-compatible. Here are some important things to keep in mind:

• Some seemingly private modules might be re-exported through public modules.
• If the branch is behind main you might see odd diffs, rebase main into this branch.

New type declarations

We found no new type declarations in this PR

Existing type declarations

packages/cli-kit/dist/private/node/constants.d.ts

@@ -30,7 +30,6 @@ export declare const environmentVariables: {
     otelURL: string;
     themeKitAccessDomain: string;
     json: string;
-    neverUsePartnersApi: string;
     skipNetworkLevelRetry: string;
     maxRequestTimeForNetworkCalls: string;
     disableImportScanning: string;

packages/cli-kit/dist/public/node/environment.d.ts

@@ -45,12 +45,6 @@ export declare function getIdentityTokenInformation(): {
  * @returns True if the JSON output is enabled, false otherwise.
  */
 export declare function jsonOutputEnabled(environment?: NodeJS.ProcessEnv): boolean;
-/**
- * If true, the CLI should not use the Partners API.
- *
- * @returns True when the CLI should not use the Partners API.
- */
-export declare function blockPartnersAccess(): boolean;
 /**
  * If true, the CLI should not use the network level retry.
  *