feat: alerts: Add lotus-miner legacy-markets alert

[rjan90]

Proposed Changes

Add alert if a storage provider is still using the lotus-miner legacy-markets.

Lotus-miner info:

Enabled subsystems: [Mining Sealing SectorStorage Markets]
StartTime: 48s (started at 2023-05-15 06:59:10 -0400 EDT)
Chain: [sync ok] [basefee 100 aFIL]
⚠ 2 Active alerts (check lotus-miner log alerts)

And checking the alert with lotus-miner log alerts:

active   system:EOL
         last raised at 2023-05-15 06:59:10.141 -0400 EDT; reason: {"message":"The lotus-miner legacy markets subsystem is deprecated and will be removed in a future release. Please migrate to [Boost](https://boost.filecoin.io) or similar markets subsystems."}

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