DF-1497: Add failing tests for stale grid references after update

[nayij]

getFeaturesManager.updateFeature assigns both grid reference properties before it applies the new geometry, and both are derived from feature.geometry, so an updated point, line or shape keeps the grid reference of its previous position while its coordinates move.

Adds unit tests covering add and update for each geometry type. The three grid reference assertions for updateFeature fail until the ordering is corrected; getFeaturesManager is exported so they can be driven directly.

No behaviour change.

Proposed change

Jira ticket: https://eaflood.atlassian.net/browse/DF-1497

Type of change

• Bug fix
• New feature
• Breaking change
• Misc. (documentation, build updates, etc)

Checklist

• You have executed this code locally and it performs as expected.
• You have added tests to verify your code works.
• You have added code comments and JSDoc, where appropriate.
• There is no commented-out code.
• You have added developer docs in README.md and docs/* (where appropriate, e.g. new features).
• The tests are passing (npm run test).
• The linting checks are passing (npm run lint).
• The code has been formatted (npm run format).

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[nayij]

Lets merge along with the fix