feat: allow approval of previous versions of job specs

[gustavogama-cll]

Description

Display the "Approve" button on the latest two versions of a job spec in the "job proposal details" page that have the "cancelled" status. This allows users to approve older versions of a job spec.

This PR must be deployed along with PR # from the core repo.

DX-534

Steps to Test

1. yarn && yarn setup
2. yarn start
3. Select a job proposal that has multiple versions
4. Check that all versions in the "cancelled" state have an Approve button
5. Approve an order version of a job spec
6. If there was another job previously in the "approved", an error message should be displayed
7. If needed, cancel the version that is currently approved (likely the newest one)
8. Try to approve an older job spec.
9. If no other version was in the "approved" state, the approval operation should complete successfully

Checklist

• This PR has an accompanying changeset if needed.

Screenshots

operator-ui-approve-old-job-spec-version.mp4

---

Update after Sebastian's suggestion to limit the set of cancelled specs that can be approved to the last two versions:

(error returned by backend attempting to approve an older spec using the previous patch)

(new UI version; only the last 2 cancelled proposals are "approvable"; a different message is displayed when approving an older spec version)

operator-ui-approve-old-job-spec-version-v3.mp4

[Copilot]

Pull Request Overview

This PR enables users to approve up to two previous cancelled versions of a job spec by introducing a new approvePrevious action and updating the UI and tests accordingly.

• Add approvePrevious to ConfirmationDialogArgs, dialog text, and handler logic
• Compute approvableCancelledJobSpecs to show approve buttons only on the two most recent cancelled specs
• Add data-testid to panels and extend tests for button visibility across statuses

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/screens/JobProposal/SpecsView.tsx	Add approvePrevious action, confirmation dialog text, approval logic, and data-testid
src/screens/JobProposal/SpecsView.test.tsx	Expand tests to cover Approve button visibility for pending, cancelled, deleted, and revoked
.changeset/flat-toys-roll.md	Add changeset entry for allowing approval of previous job spec versions

Comments suppressed due to low confidence (2)

src/screens/JobProposal/SpecsView.tsx:253

• [nitpick] Consider using a more specific data-testid (e.g., spec-expansion-panel) to clearly identify these panels in tests and prevent collisions with other components.

data-testid="expansion-panel"

src/screens/JobProposal/SpecsView.test.tsx:409

• [nitpick] Add a test to verify that clicking the "Approve" button on a previous version opens the confirmation dialog with the correct title (Approve Previous Version of Job Proposal) and body content, ensuring the new approvePrevious variant is displayed as intended.

  })

[cl-sonarqube-production]

Quality Gate passed

Issues
2 New issues
1 Fixed issue
0 Accepted issues

Measures
0 Security Hotspots
91.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube