Add git-upstream-name

[unixorn]

Description

Add helper script git-upstream-name that prints the upstream of the current branch

Type of changes

• Add/update a helper script
• Add/update link to an external resource like a blog post or video
• Text cleanups/updates
• Test updates

Checklist

• I have read the CONTRIBUTING document.
• All new and existing tests pass.
• Any scripts added use #!/usr/bin/env interpreter instead of potentially platform-specific direct paths (#!/bin/sh is an allowed exception)
• Scripts added/updated in this PR are all marked executable.
• Scripts added/updated in this PR do not have a language file extension unless they are meant to be sourced and not run standalone. No one should have to know if a script was written in bash, python, ruby or whatever. Not including file extensions makes it easier to rewrite the script in another language later without having to change every reference to the previous version.
• I have added a credit line to README.md for any new scripts.
• If there was no author credit inside a script added in this PR, I have added one.
• I have confirmed that the link(s) in my PR are valid.

License Acceptance

• This repository is Apache version 2.0 licensed (some scripts may have alternate licensing inline in their code) and by making this PR, I am contributing my changes to the repository under the terms of the Apache 2 license.

[github-actions]

MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.0s
✅ COPYPASTE	jscpd	yes		no	1.18s
✅ MARKDOWN	markdownlint	1		0	1.35s
⚠️ MARKDOWN	markdown-table-formatter	1		1	0.68s
✅ REPOSITORY	devskim	yes		no	0.81s
✅ REPOSITORY	dustilock	yes		no	0.02s
✅ REPOSITORY	gitleaks	yes		no	0.41s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	secretlint	yes		no	1.07s
✅ REPOSITORY	syft	yes		no	0.37s
✅ REPOSITORY	trivy	yes		no	2.97s
✅ SPELL	misspell	3		0	0.07s
✅ YAML	prettier	1		0	0.56s
✅ YAML	v8r	1		0	2.27s
✅ YAML	yamllint	1		0	0.15s

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[qlty-cloud-legacy]

Code Climate has analyzed commit 1baf84b and detected 0 issues on this pull request.

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