_ci_ Remove lotus soup + testplans

[ianconsolata]

Related Issues

Discussion with Anton: https://filecoinproject.slack.com/archives/CP50PPW2X/p1670336395297749

The trigger-testplans job has been failing for the last month, because the testground-as-a-service endpoint we use no longer exists. While we could run testground ourselves, conversations with @nonsense seem to indicate that the things it covers are currently being tested by our itest suite, and therefore unnecessary. If we do want to re-enable testground, we should likely rebuild the testground infrastructure and test cases using a more recent version of testground, and lotus-soup can be resurrected from the git history at that point to serve as a basis for that work.

Proposed Changes

This removes the trigger-testplans job, the build-lotus-soup job that was used to create the triggered testplans, and the build-debug job which seems to be building a debug network but not using it for anything, or persisting the artifacts anywhere.

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, build, chore, ci, docs, perf, refactor, revert, style, test
  • area, e.g. api, chain, state, market, mempool, multisig, networking, paych, proving, sealing, wallet, deps
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green