update-project-version: Show project names and versions in PR body and title (when possible)

[bkeryan]

What does this Pull Request accomplish?

Update ni/python-actions/update-project-version to show the project names and versions.

• If the PR is for a single project, include the name and version in the PR title. Otherwise, just say "Updating project versions".
• Include a table of project names, verisons, and paths in the PR body.

Also change how we show the branch name in the title:

• Move the branch name to the beginning of the PR title and put it in brackets. We have been using this convention for release-branch PRs in nidaqmx-python and measurement-plugin-python. GitHub email notifications put the repo name in brackets, so the email titles will look like "[ni/nitypes-python] [releases/1.0] chore: Update project nitypes to v1.0.1".
• Omit the branch name if it's not "main" or "master".

Why should this Pull Request be merged?

Closes #17

Disambiguate the "chore: Update project version - main" emails in my inbox.

What testing has been done?

bkeryan/nitypes-python#15

[bkeryan]

FYI @jfriedri-ni

[bkeryan]

Screenshot of test PR, for posterity: