Add a function for iterating through all exe locations in the PATH.

Review Request #12617 — Created Sept. 21, 2022 and submitted — Latest diff uploaded

chipx86
RBTools
release-4.x
rbtools

This introduces rbtools.utils.filesystem.iter_exes_in_path(), which
looks for the specified executable in each path in $PATH, yielding
each one that's found. This can be used to scan for multiple instances
of an executable, trying to find a specific version.

is_exe_in_path() now wraps this, returning just the first result.

Unit tests pass.

Tested this extensively with the Diff Tool scanning.

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