Remove Formula + update-formula workflow (moved to homebrew-kane tap)

[samyakLambda]

Summary

Removes Formula/kane-cli.rb and .github/workflows/update-formula.yml. Both have been relocated to the proper Homebrew tap repo: https://github.com/LambdaTest/homebrew-kane.

Why

Homebrew's tap convention is user/homebrew-<tap>. The formula being inside kane-cli meant brew install LambdaTest/kane/kane-cli failed (brew expected LambdaTest/homebrew-kane). The tap now lives at its correct location, so the copies here are dead code.

Companion PRs — merge these FIRST

1. https://github.com/LambdaTest/homebrew-kane/pull/1 — adds the listener workflow to the tap (non-breaking)
2. LambdatestIncPrivate/v16 PR #408 — retargets the repository_dispatch to homebrew-kane
3. This PR (merge last — only after v16 has been deployed and the next release cycle confirms the new pipeline works)

Merging this PR before #1 and v16#408 will break the release pipeline. Please wait.

Test plan

• homebrew-kane#1 is merged
• v16#408 is merged and on the prod branch
• Next public release has run successfully end-to-end with the new pipeline
• Only then: merge this PR

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