docs: add jira input to cloud Connect docs

[JakeSCahill]

What

Single-sources the new Redpanda Connect jira input into the Cloud docs, as flagged by the auto-docs PR (redpanda-data/rp-connect-docs#462):

• New stub page modules/develop/pages/connect/components/inputs/jira.adoc including connect:components:inputs/jira.adoc[tag=single-source]
• Nav entry under Connect inputs (alphabetical, after inproc)
• What's New (July 2026) → Redpanda Connect updates → Inputs entry

Notes

• The jira processor is deprecated in the same Connect release; its page carries a deprecation notice pointing to this input (handled in DOC-1621 Shadowing in Cloud #462).

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[coderabbitai]

📝 Walkthrough

Walkthrough

Added a Jira input documentation page using shared content, linked it in the Connect inputs navigation, and documented the Jira input in the July 2026 Redpanda Connect updates with its JQL-based incremental polling behavior.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: michelerp

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description misses required template sections, including the issue link, review deadline, page previews, and the checks checklist.	Add the Description section with the issue link and deadline, plus Page previews and the required Checks checklist items.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Title check	✅ Passed	The title clearly summarizes the main change: adding the Jira input to the Cloud docs.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch doc-connect-jira-input

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