CI: Run miri using tree borrows in addition to the existing stacked borrows

[tatsuya6502]

Our CI runs miri on the following internal modules, which contain a bunch of unsafe codes.

• deque
• timer_wheel

And we have only used miri's stacked borrows model to detect pointer aliasing violations.

This pull request adds miri tests using tree borrows model so that our CI will detect the problems like the one reported by #452.

https://github.com/moka-rs/moka/actions/runs/10545853093/job/29216602204

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.91%. Comparing base (c5e5ba3) to head (63f8928).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #454   +/-   ##
=======================================
  Coverage   94.91%   94.91%           
=======================================
  Files          44       44           
  Lines       20938    20938           
=======================================
  Hits        19874    19874           
  Misses       1064     1064           

[tatsuya6502]

Merging.