fix(#12259): mark persistent turbo tasks uncached

[lalalune]

Summary

• set cache: false on the generic persistent Turbo dev task
• set cache: false on the generic persistent Turbo start task
• leave the rest of the turbo.json pipeline rewrite: delete the vestigial test task, un-cache dev/start, strip lint's build deps, kill double-run side runners, guard the bun.lock version #12259 pipeline rewrite untouched for separate PRs

Evidence

• .github/issue-evidence/12259-turbo-persistent-cache.md

Verification

node -e "const fs=require('fs'); const t=JSON.parse(fs.readFileSync('turbo.json','utf8')).tasks; if (t.dev.cache !== false || t.start.cache !== false) process.exit(1);"
node -e "JSON.parse(require('fs').readFileSync('turbo.json','utf8'));"
git diff --check origin/develop..HEAD

Screenshots/recordings: N/A, Turbo config only; no UI changed.

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[lalalune]

Local validation pass from an isolated checkout at /tmp/eliza-pr-12917.

Commands run:

node -e "const fs=require('fs'); const t=JSON.parse(fs.readFileSync('turbo.json','utf8')).tasks; if (t.dev.cache !== false || t.start.cache !== false) process.exit(1);"
node -e "JSON.parse(require('fs').readFileSync('turbo.json','utf8'));"
git diff --check github-develop..HEAD
git diff --stat github-develop...HEAD

Result: all passed. The merge-base diff is limited to turbo.json and .github/issue-evidence/12259-turbo-persistent-cache.md; start and dev are both persistent tasks and now explicitly set cache: false.