fix(net): bound QGETDATA request tracking

[PastaPastaPasta]

Issue being fixed or feature implemented

Inbound QGETDATA registration happened before validation, and each fresh quorumHash produced a distinct map key. Entries remained for the expiry window while cleanup depended on block-tip callbacks that are skipped during IBD and while unsynced, allowing an MNAuth peer or unauthenticated qwatch peer to grow request tracking without a hard bound.

This PR is now the request-tracking half of the original combined change. Requester-supplied response-error validation was split into #7605 so the two defects can be reviewed and merged independently.

What was done?

• Prevalidate the LLMQ type and active-chain block before tracking:
  • unregistered LLMQ types return QUORUM_TYPE_INVALID, score 100, and are not tracked;
  • unknown or off-active-chain blocks return QUORUM_BLOCK_NOT_FOUND unscored and are not tracked;
  • active-chain blocks are registered before the commitment lookup so repeated uncached misses are rate-limited.
• Bound attacker-controlled inbound tracking to 64 live entries per requester and 4096 globally. Outbound requests initiated by this node do not consume those budgets.
• Score authenticated requesters that exhaust their own budget by 25. Shared/global exhaustion is not scored because the arriving peer is not necessarily responsible.
• Run expired-request cleanup every minute independently of block-tip progress, while retaining tip-triggered cleanup.

Unauthenticated qwatch peers continue to share the null identity used by the existing per-key limiter. Exhaustion of that shared 64-entry budget is therefore unscored; the independent 4096-entry global cap remains the hard memory bound.

How Has This Been Tested?

• Full local make -j13 build on macOS arm64 using the prebuilt depends tree.
• ./src/test/test_dash --run_test=llmq_qgetdata_tests
• ./src/test/test_dash --run_test='llmq_*' (75 cases)
• /opt/homebrew/bin/python3.9 test/functional/test_runner.py p2p_quorum_data.py
• test/lint/all-lint.py
• git diff --check

The Python lint subcheck skipped because flake8 is not installed; the remaining lint checks passed.

Breaking Changes

None.

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

This pull request was created by Codex.