fix: how --json parameter output is handled

[scolladon]

Explain your changes

---

Returned the result object so --json handler can use it to display result when the flag is set

Does this close any currently open issues?

---

closes #568

• Jest tests added to cover the fix.
• NUT tests added to cover the fix.
• E2E tests added to cover the fix.

This fix will not handle the warning in the error array.
The git diff command in this case does not throw an error (exit code is 0) but write the warning message in stderr
We catch every error message from stderr to treat those as error and stop execution, by design.

[codeclimate]

Code Climate has analyzed commit cfac679 and detected 0 issues on this pull request.

View more on Code Climate.

[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	6		0	0.1s
✅ COPYPASTE	jscpd	yes		no	3.56s
✅ JAVASCRIPT	eslint	69	0	0	6.02s
✅ JAVASCRIPT	prettier	69	0	0	3.24s
✅ JSON	eslint-plugin-jsonc	19	0	0	1.92s
✅ JSON	jsonlint	19		0	0.17s
✅ JSON	npm-package-json-lint	yes		no	0.48s
✅ JSON	prettier	19	0	0	0.45s
✅ JSON	v8r	19		0	9.89s
✅ MARKDOWN	markdownlint	10	0	0	0.7s
❌ MARKDOWN	markdown-link-check	10		1	16.76s
✅ MARKDOWN	markdown-table-formatter	10	0	0	0.26s
✅ REPOSITORY	checkov	yes		no	12.16s
✅ REPOSITORY	gitleaks	yes		no	2.75s
✅ REPOSITORY	git_diff	yes		no	0.02s
✅ REPOSITORY	secretlint	yes		no	1.42s
✅ REPOSITORY	trivy	yes		no	4.93s
✅ SPELL	cspell	129		0	5.57s
✅ TYPESCRIPT	eslint	2	0	0	1.77s
✅ YAML	prettier	12	1	0	0.46s
✅ YAML	v8r	12		0	16.42s
✅ YAML	yamllint	12		0	0.29s

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (27de245) 100.00% compared to head (cfac679) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #608   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           32        32           
  Lines          898       898           
=========================================
  Hits           898       898           

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[github-actions]

Shipped in release v5.20.0.
You can install the new version using the version number or the latest-rc channel

$ sfdx plugins:install sfdx-git-delta@latest-rc
$ sfdx plugins:install [email protected]