(cherry picked from commit ff7b8eb)

Backported PRs:
- [x] #49357 <!-- Fix unclosed code fence in src/manual/methods.md -->
- [x] #50842 <!-- Avoid race conditions with recursive rm -->
- [x] #50858 <!-- Add a `threadpool` parameter to `Channel` constructor
-->
- [x] #50730 <!-- Fix integer overflow in `isapprox` -->
- [x] #50823 <!-- Make ranges more robust with unsigned indexes. -->
- [x] #50915 <!-- Add note the `Task` about sticky bit -->
- [x] #50989 <!-- fix incorrect results in `expm1(::Union{Float16,
Float32})` -->
- [x] #50912 <!-- Separate foreign threads into a :foreign threadpool
-->
- [x] #51019 <!-- fix a case of potentially use of undefined variable
when handling error in distributed message processing -->
- [x] #51222 <!-- Check again if the tty is open inside the IO lock -->
- [x] #51254 <!-- Ryu: make sure adding zeros does not overwrite
trailing dot -->
- [x] #51284 <!-- Avoid infinite loop when doing SIGTRAP in arm64-apple
-->
- [x] #51491 <!-- Throw clearer ArgumentError for strip with two string
args -->
- [x] #51531 <!-- fix `_tryonce_download_from_cache` (busybox.exe
download error) -->