[ci] Added fork guard to repository management workflows

[asmodehn]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Description of Changes

This PR adds safeguards to GitHub workflows to prevent them from being triggered in forked repositories.

[coderabbitai]

📝 Walkthrough

Walkthrough

Multiple GitHub Actions workflow files are updated to add github.repository == 'openwisp/openwisp-users' guards on job-level if conditions, preventing jobs from running when workflows are reused in forked repositories. Several existing if expressions are also reformatted from single-line to multiline folded YAML (if: >) style without changing their logic.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• openwisp/openwisp-users#496: Introduced the bot-changelog-runner.yml workflow whose job if conditions are directly modified in this PR.

Suggested labels

github_actions

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR follows the template partially, but it omits the issue reference and screenshot and gives only a vague change summary.	Add the issue reference, screenshot section, and a more specific description of the workflow guard changes.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Bug Fixes	✅ Passed	PASS: Changes are GitHub Actions workflow guards only; no core user-facing bug fix, so regression tests/Selenium are not applicable.
Title check	✅ Passed	The title uses the required [ci] type and accurately summarizes the repository-guard workflow changes.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coveralls]

coverage: 98.15% (+0.02%) from 98.128% — asmodehn:prevent_github_workflow_in_forks into openwisp:master

[nemesifier]

Thanks @asmodehn