Merge PDP e2e workflow into ci.yml via workflow_dispatch

[Copilot]

e2e-test-pdp-caching-layers.yml was nearly identical to ci.yml up through devnet startup, creating a maintenance burden for any changes to the shared setup logic.

Approach

Implements @rvagg's Option 2: add workflow_dispatch to ci.yml with a pdp_caching_test boolean input (default: true) and component override inputs, then gate the PDP-specific phases behind that flag.

Changes

• workflow_dispatch trigger — adds pdp_caching_test (bool, default true) + component overrides (curio, lotus, filecoin_services, synapse_sdk)
• init-flags step — single step that computes both the foc-devnet init flag string from override inputs and a pdp-test boolean output; all downstream step conditions reference steps.init-flags.outputs.pdp-test rather than repeating the event/input expression inline
• Start command — uses --notest when pdp-test=true, plain --parallel otherwise
• Existing validation steps (devnet-info.json, schema/examples checks) — gated by pdp-test != 'true'; replaced by PDP phase 6 extraction when running in PDP mode
• PDP caching phases 5–10 — appended verbatim from the old workflow, each gated by pdp-test == 'true' && start_cluster.outcome == 'success'
• Stop-cluster — promoted to if: always() so cleanup runs even on PDP test failures
• e2e-test-pdp-caching-layers.yml — deleted

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