feat(adoption-insights): add Est. Time Saved column to Top Templates card

[rajin-kichannagari]

Read the rhdh.redhat.com/time-saved annotation from template entities and display a calculated Est. Time Saved column (annotation × execution count) on the Top Templates card. Templates without the annotation show —.

RHDHPLAN-1553 / RHIDP 15188

✔️ Checklist

• [X ] A changeset describing the change and affected packages. (more info)
• Added or Updated documentation
• [ X] Tests for new functionality and regression tests for bug fixes
• [ X] Screenshots attached (for UI changes)

[rhdh-gh-app]

Important

This PR includes changes that affect public-facing API. Please ensure you are adding/updating documentation for new features or behavior.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@red-hat-developer-hub/backstage-plugin-adoption-insights	workspaces/adoption-insights/plugins/adoption-insights	minor	v0.8.3

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
351	1	350	0

View the top 1 failed test(s) by shortest run time

Constants TEMPLATE_TABLE_HEADERS should have correct headers

Stack Traces | 0.004s run time

Error: expect(received).toEqual(expected) // deep equality

- Expected  - 0
+ Received  + 4

@@ -5,6 +5,10 @@
    },
    Object {
      "id": "executions",
      "titleKey": "table.headers.executions",
    },
+   Object {
+     "id": "estTimeSaved",
+     "titleKey": "table.headers.estTimeSaved",
+   },
  ]
    at Object.toEqual (.../utils/__tests__/constants.test.tsx:63:36)
    at Promise.finally.completed (.../jest-circus/build/jestAdapterInit.js:1557:28)
    at new Promise (<anonymous>)
    at callAsyncCircusFn (.../jest-circus/build/jestAdapterInit.js:1497:10)
    at _callCircusTest (.../jest-circus/build/jestAdapterInit.js:1007:40)
    at processTicksAndRejections (node:internal/process/task_queues:104:5)
    at _runTest (.../jest-circus/build/jestAdapterInit.js:947:3)
    at .../jest-circus/build/jestAdapterInit.js:849:7
    at _runTestsForDescribeBlock (.../jest-circus/build/jestAdapterInit.js:862:11)
    at _runTestsForDescribeBlock (.../jest-circus/build/jestAdapterInit.js:857:11)
    at run (.../jest-circus/build/jestAdapterInit.js:761:3)
    at runAndTransformResultsToJestFormat (.../jest-circus/build/jestAdapterInit.js:1918:21)
    at jestAdapter (.../jest-circus/build/runner.js:101:19)
    at runTestInternal (.../jest-runner/build/testWorker.js:275:16)
    at runTest (.../jest-runner/build/testWorker.js:343:7)
    at Object.worker (.../jest-runner/build/testWorker.js:497:12)

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