Add dependency checks for Git.

Review Request #12548 — Created Aug. 18, 2022 and submitted — Latest diff uploaded

Information

RBTools
release-4.x

Reviewers

This updates GitClient to add formal support for dependency checks.
GitClient.check_dependencies() now determines if git or git.cmd
(available on Windows) is installed.

GitClient.get_local_path() now calls this instead of checking for
dependencies itself, emitting a warning if dependencies haven't already
been checked via setup() or has_dependencies(). The same is done
with the GitClient.git property, which used to be an attribute.

Unit tests have been updated to include new dependency-related tests. If
a suitable git tool isn't installed, tests that depend on it will be
automatically skipped.

Unit tests pass on Python 3.7-3.11.

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