Switched probe-rs to be resolved as a bazel host side executable and not a part of target resolution

[ngraf3255]

Fixes issue where flash rules are not compatible with @platforms//os:none due to requiring a host to run probe-rs. Reason for this change is as follows:

I have networking library dependency used in an embedded firmware release. This library builds for both POSIX platforms and for smoltcp based embedded networking. To do so, it uses the @platforms//os platform to configure the build. Due to the probe-rs ruleset being a native_binary it requires a host to run on.

Realisically the ELF should be built for the embedded target (and be selectable with the --platforms key), while probe-rs should be selected for the host. The following steps were done to acomplish this:

• Adds a new executable rule in probe_rs/private/run.bzl
• Resolves probe-rs as something for bazel to execute and not produce
• Wraps the probe-rs executable in a small script for platform compatibility
• This should keep the existing probe_rs.run(name, elf, chip, args=...) API the same in probe_rs/defs.bzl