Rollup merge of #147952 - ferrocene:pvdrz/remote-test-client-timeout, r=Enselic

Add a timeout to the `remote-test-client` connection

Currently, the `remote-test-client` doesn't have a timeout when connecting to the `remote-test-server`. This means that running tests using it can hang indefinitely which causes issues when running tests on CI, for example.

This PR now sets a default timeout of 5 minutes, meaning that if, for example, `TEST_DEVICE_ADDR=<IP:PORT> ./x test --target riscv64gc-unknown-linux-gnu tests/ui` is run and the `remote-test-server` is not reachable by the client, the client will panic after the timeout is reached.

Additionally, the `TEST_DEVICE_CONNECT_TIMEOUT` env variable can be used to set up the timeout to any value (in seconds).

This PR also wires up a test step for `remote-test-client`, which didn't previously have tool tests run in CI.

Edit: ~~blocked by rust-lang/rust#149071~~
tree: 772c914675b43531ebfae31d16ce63da3faf0f8e
  1. .github/
  2. compiler/
  3. library/
  4. LICENSES/
  5. src/
  6. tests/
  7. .clang-format
  8. .editorconfig
  9. .git-blame-ignore-revs
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .ignore
  14. .mailmap
  15. bootstrap.example.toml
  16. Cargo.lock
  17. Cargo.toml
  18. CODE_OF_CONDUCT.md
  19. configure
  20. CONTRIBUTING.md
  21. COPYRIGHT
  22. INSTALL.md
  23. LICENSE-APACHE
  24. license-metadata.json
  25. LICENSE-MIT
  26. package.json
  27. README.md
  28. RELEASES.md
  29. REUSE.toml
  30. rust-bors.toml
  31. rustfmt.toml
  32. triagebot.toml
  33. typos.toml
  34. x
  35. x.ps1
  36. x.py
  37. yarn.lock
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