Fix parallel state run time output

[garethgreenaway]

What does this PR do?

When states are running in parallel, ensure that the total run time produced by the highstate outputter takes that into account.

What issues does this PR fix or reference?

Fixes: #61999

Previous Behavior

When running states in parallel the total run time was incorrect, combining the runtime for all sates.

New Behavior

When running states in parallel, we calculate the run time for states that were not run in parallel as normal and add the duration of the longest running parallel state run.

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

Yes

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Detected Issues (click me)

Check Known Missing Docstrings...........................................Failed
- hook id: invoke
- duration: 0.98s
- exit code: 1
/home/runner/.cache/pre-commit/repo297mwl1a/py_env-python3/lib/python3.9/site-packages/_distutils_hack/init.py:30: UserWarning: Setuptools is replacing distutils.

warnings.warn("Setuptools is replacing distutils.")

The function 'assumed_creds' on 'salt/utils/aws.py' does not have a docstring

Found 1 errors

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Thanks again!