Add regression tests for cli safe flash escaping

[Sanskar121543]

Summary

Adds regression coverage for _cli_safe_flash to verify:

• HTML content is safely escaped before rendering in flash messages
• CLI output formatting correctly converts HTML tags to terminal-safe text

Why

This helps prevent accidental unsafe rendering of user-controlled content in FAB auth manager flash messages.

[potiuk]

@Sanskar121543 A few things need addressing before review — see our Pull Request quality criteria.

• ❌ Pre-commit / static checks — Failing: CI image checks / Static checks. See docs.

No rush.

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Note: This comment was drafted by an AI-assisted triage tool and may contain mistakes. Once you have addressed the points above, an Apache Airflow maintainer — a real person — will take the next look at your PR. We use this two-stage triage process so that our maintainers' limited time is spent where it matters most: the conversation with you.

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Drafted-by: Claude Code (Opus 4.7); reviewed by @potiuk before posting

[Sanskar121543]

@Sanskar121543 A few things need addressing before review — see our Pull Request quality criteria.

• ❌ Pre-commit / static checks — Failing: CI image checks / Static checks. See docs.

No rush.

Note: This comment was drafted by an AI-assisted triage tool and may contain mistakes. Once you have addressed the points above, an Apache Airflow maintainer — a real person — will take the next look at your PR. We use this two-stage triage process so that our maintainers' limited time is spent where it matters most: the conversation with you.

Drafted-by: Claude Code (Opus 4.7); reviewed by @potiuk before posting

Thanks! I fixed the static check issue by removing the unintended generated file change and updated the PR branch. The checks should now be clean.

[potiuk]

@Sanskar121543 A few things need addressing before review — see our Pull Request quality criteria.

Issues found:

• ❌ Pre-commit / static checks: CI image checks / Static checks is failing. Run prek run --from-ref main --stage pre-commit locally and fix anything that flags. See the static-checks docs.

What to do next:

• Push a fix for the static-check failure.

No rush — take your time. We appreciate your contribution and are happy to wait for updates. If you have questions, feel free to ask on the Airflow Slack.

---

Note: This comment was drafted by an AI-assisted triage tool and may contain mistakes. Once you have addressed the points above, an Apache Airflow maintainer — a real person — will take the next look at your PR. We use this two-stage triage process so that our maintainers' limited time is spent where it matters most: the conversation with you.

[Sanskar121543]

Hi @vincbeck, just following up on this PR when you get a chance.

The static check issue mentioned by @potiuk has been addressed and the branch has been updated. All relevant checks should now be passing.

Would appreciate a review whenever you have time. Thanks!

[vincbeck]

CI is still failing

[Sanskar121543]

CI is still failing

Thanks for checking. I pushed another fix in commit 71260b9 to address the remaining static check issues (newline at EOF and removal of the unintended generated OpenAPI file change). The workflows are rerunning now.