[roll] Roll fuchsia Revert "[bazel_sdk] Fix and simplify @fuchsia_sdk sysroot-related templates"

This reverts commit 39b4f8e53318cb5dab822f306a89b57fc7c72cdb.

Reason for revert: Breaks hello_cpp_test and hello_rust_test

Original change's description:
> [bazel_sdk] Fix and simplify @fuchsia_sdk sysroot-related templates
>
> This is a preliminary CL to cleanup things before fixing issue 122247
>
> - @rules_fuchsia//fuchsia/constraints/BUILD.bazel:
>   Add new `is_fuchsia_x64` and `is_fuchsia_arm64` config conditions
>   that hold true when building for Fuchsia/x64 or Fuchsia/arm64
>   respectively.
>
>   This is used to replace the use of @fuchsia_clang//:x86_build and
>   @fuchsia_clang//:arm_build, whose names are misledaing and defined
>   in ways that are inconsistent with the rest of @rules_fuchsia
>   constraints.
>
>   The `is_` prefix is used to distinguish these targets from
>   @rules_fuchsia//fuchsia/constraints/platforms:fuchsia_{x64,arm64}
>   which are platform() definitions, and whose label cannot be used
>   in select() conditions.
>
> - sysroot_template.BUILD: Replace @clang_fuchsia//:{arm,x86}_build
>   with @rules_fuchsia//fuchsia/constraints:is_fuchsia_{arm64,x64}.
>
>   This removes an un-necessary dependency on @fuchsia_clang.
>
> - sysroot_arch_subtemplate: Fix the definition of "dest" to also
>   depend on the variant (i.e. "lib"  by default, but "lib/asan"
>   otherwise).
>
>   Also use select() with fuchsia-specific conditions to avoid
>   an un-necessary fuchsia_select() call. In other words,
>   replace:
>
>   ```
>     # From @fuchsia_sdk//pkg/sysroot/x64/dist/BUILD.bazel
>
>     fuchsia_package_resource_group(
>       name = "dist",
>       srcs = fuchsia_select({
>         "@fuchsia_clang:arm_novariant": [ ... ],
>         "@fuchsia_clang:arm_asan": [ ... ],
>       })
>       ...
>       target_compatible_with = [ "@platforms//os:fuchsia" ],
>     )
>   ```
>
>   with:
>
>   ```
>     fuchsia_package_resource_group(
>       name = "dist",
>       srcs = select({
>         "@fuchsia_clang:novariant": [ ... ],
>         "@fuchsia_clang:asan": [ ... ],
>       })
>       ...
>       target_compatible_with = [ "@platforms//os:fuchsia" ],
>     )
>   ```
>
>   Since the `target_compatible_with` value already ensures this
>   is only compatible with Fuchsia, the fuchsia_select() was
>   redundant. Similarly, using @fuchsia_clang:<arch>_<variant>
>   in an <arch>-specific BUILD.bazel file was too, so these
>   can be replaced with @fuchsia_clang:<variant> instead.
>
> Original-Bug: 122247
> Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/804949

Original-Bug: 122247
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/808170
Original-Revision: 019a28e01d6643cf09712cdda6814676db2176df
GitOrigin-RevId: e0afe96da379f28f62d213c6e1abed9e489de28f
Change-Id: I64f50097ce5b3d776aae38677e55387bbb371794