rust: Upgrade 1.87.0 -> 1.88.0

rust: Upgrade 1.87.0 -> 1.88.0

Rust stable version updated to 1.88.0.
https://blog.rust-lang.org/2025/06/26/Rust-1.88.0/

* Rebase existing patches with v1.88.0

* Exclude tidy and coverage-dump from OE self-tests due to test failures
  Although the build completes successfully, OE self-tests fail:
  tools/coverage-dump panics during test execution.
  tools/tidy fails due to a mismatched GCC submodule commit.
  These tests are excluded to allow successful OE self-test runs.

* Two tests from the`codegen` modules now fail only on riscv64.
  Enable them on arm32/64 and x86-32/64 targets, while restricting
  them on riscv64 via `only-<target_arch>` tags.

  Bugzilla link - https://bugzilla.yoctoproject.org/show_bug.cgi?id=15944

  Test Results Summary:
  +-----------+--------+---------+
  | Machine   | Passed | Ignored |
  +-----------+--------+---------+
  | arm-32    | 28,664 | 1,451   |
  | arm-64    | 28,748 | 1,396   |
  | x86-32    | 28,657 | 1,432   |
  | x86-64    | 28,904 | 1,213   |
  | riscv-64  | 28,722 | 1,421   |
  +-----------+--------+---------+

Signed-off-by: Jayasurya Maganuru <Maganuru.Jayasurya@windriver.com>
Signed-off-by: Deepesh Varatharajan <Deepesh.Varatharajan@windriver.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>