refactor: remove unused spork.h usages all over codebase

[knst]

What was done?

See commits. Removed stub or useless spork includes and initialization.

How Has This Been Tested?

Run unit & functional tests

Breaking Changes

N/A

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 8c0f42a and 0a2a27d.

📒 Files selected for processing (8)

• src/node/miner.cpp
• src/qt/walletmodel.cpp
• src/rpc/mining.cpp
• src/test/blockfilter_index_tests.cpp
• src/test/evo_deterministicmns_tests.cpp
• src/test/miner_tests.cpp
• src/test/util/mining.cpp
• src/test/validation_chainstatemanager_tests.cpp

💤 Files with no reviewable changes (8)

• src/test/evo_deterministicmns_tests.cpp
• src/rpc/mining.cpp
• src/test/blockfilter_index_tests.cpp
• src/test/validation_chainstatemanager_tests.cpp
• src/node/miner.cpp
• src/test/util/mining.cpp
• src/test/miner_tests.cpp
• src/qt/walletmodel.cpp

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Walkthrough

This pull request removes the spork.h header include from eight source files across production code, RPC, Qt, and test modules. In one test file (evo_deterministicmns_tests.cpp), related spork key initialization code is also removed. The changes eliminate unused dependencies without modifying control flow or functionality in the remaining code.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: removing unused spork.h includes across the codebase.
Description check	✅ Passed	The description is related to the changeset, explaining what was done (removed stub/useless spork includes) and how it was tested.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[github-actions]

✅ No Merge Conflicts Detected

This PR currently has no conflicts with other open PRs.

[UdjinM6]

utACK 0a2a27d