[MRF-13.5] PLU-520: (frontend) refactor contexts

[pregnantboy]

changes

1. Moving UI components into a dedicated components directory
2. Extracting step display logic into a new StepsToDisplayContext
3. Replacing the StepExecutionsToIncludeContext with the more comprehensive StepsToDisplayContext
4. Simplifying the MrfContextProvider by removing the explicit steps prop
5. Creating a dedicated StepsList component to handle the rendering of steps (Editor component was getting bloated)

[pregnantboy]

Warning

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• [MRF-18] PLU-520: remove mrf-related steps and config on checkstep #1347
• [MRF-17] PLU-520: (frontend) allow if-then and for-each for different branches #1345
• [MRF-16] PLU-520: style approve/reject steps, show approval tag for yes/no #1344
• [MRF-15] PLU-520: (frontend) allow reordering of steps across MRF steps #1343
• [MRF-14] PLU-520: (frontend) conditionally hide steps based on approval branch #1293
• [MRF-13.5] PLU-520: (frontend) refactor contexts #1292 👈 (View in Graphite)
• [MRF-13] PLU-520: (frontend) refactor cache manipulation #1290
• [MRF-12] PLU-520: (frontend) set approval config when creating step #1288
• [MRF-11] PLU-520: (backend) create step approval config #1287
• [MRF-10] PLU-520: pass prevStep instead of prevStepId #1286
• [MRF-9] PLU-520: MRF context and refactor #1349
• [MRF-8] PLU-520: New Approve-Reject component (frontend) #1284 : 1 other dependent PR (#1285 )
• [MRF-7] PLU-520: remove mrf actions steps if necessary #1275
• [MRF-6] PLU-520: testStep for mrf actions should test multiple steps #1269
• [MRF-5] PLU-520: refactor frontend to allow test step on mrf actions #1268
• [MRF-4] PLU-520: automatically create/delete/update mrf steps on check step #1267
• [MRF-3] PLU-520: introduce mrf action that cannot be added by user #1266
• [MRF-2] PLU-520: parse formsg workflow data + refactor #1265
• [MRF-1] PLU-520: allow mrf forms to be connected #1264
• mrf/trunk

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[linear]

PLU-520 MRF: Approvals

[datadog-opengovsg]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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