fix(DX-10057): remove dead --branch flag from auth:tokens:add

[cs-raj]

Summary

• Removes the --branch hidden flag from auth:tokens:add — it was defined in the flag schema but never read in run() and never persisted in configHandler.set(). Token objects were always saved as { token, apiKey, type } or { token, apiKey, environment, type } — branch was never included. The feature was planned but never completed.
• Removes two it.skip tests that only existed to cover branch-on-token behaviour.
• Removes --branch args from the one active test that was passing them vacuously (assert was inside a catch block that never fired, since oclif accepted the flag without error).

Root cause

The --branch flag appears to be an early design for branch-scoped token storage that was never finished. There are zero reads of addTokenFlags.branch anywhere in the command, and no branch field in any configHandler.set call.

Test plan

• Run npx mocha --require ts-node/register --require tsconfig-paths/register test/unit/commands/tokens-add.test.ts in packages/contentstack-auth — 5 passing, 2 pre-existing failures (unrelated nock.cleanAll issue present on v2-dev before this change)
• Verify csdx auth:tokens:add --branch main now errors with Unexpected argument: --branch

Related

Part of DX-10057 deprecated flags/aliases cleanup (cli-plugins PR: contentstack/cli-plugins#325)

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