Merge bitcoin/bitcoin#30072: refactor prep for package rbf

2fd34ba Add sanity checks for various ATMPArgs booleans (Greg Sanders)
20d8936 [refactor] make some members MemPoolAccept-wide (glozow)
cbbfe71 cpfp carveout is excluded in packages (glozow)
69f7ab0 Add m_allow_sibling_eviction as separate ATMPArgs flag (Greg Sanders)
57ee302 Add description for m_test_accept (Greg Sanders)

Pull request description:

  First few commits of bitcoin/bitcoin#28984 to set the stage for the package RBF logic.

  These refactors are preparation for evaluating an RBF in a multi-proposed-transaction context instead of only a single proposed transaction. Also, carveouts and sibling evictions only should work in single RBF cases so add logic to preclude multi-tx cases in the future.

  No behavior changes aside from bailing earlier from failed carve-outs.

ACKs for top commit:
  glozow:
    reACK 2fd34ba via range-diff
  sr-gi:
    utACK [2fd34ba](bitcoin/bitcoin@2fd34ba)
  theStack:
    re-ACK 2fd34ba

Tree-SHA512: 5071c5b8d9b8d2c9faa278c8c4df31de288cb407a68e4d55544c588caff6c86160cce7825453549c6ed69e29d9ccb5ee2d4a518b18f563bfb12f2ced073fe42a

Author: glozow

doc/policy/packages.md

@@ -48,8 +48,13 @@ The following rules are enforced for all packages:
      heavily connected, i.e. some transaction in the package is the ancestor or descendant of all
      the other transactions.
 
-The following rules are only enforced for packages to be submitted to the mempool (not enforced for
-test accepts):
+* [CPFP Carve Out](./mempool-limits.md#CPFP-Carve-Out) is disabled in packaged contexts. (#21800)
+
+   - *Rationale*: This carve out cannot be accurately applied when there are multiple transactions'
+     ancestors and descendants being considered at the same time.
+
+The following rules are only enforced for packages to be submitted to the mempool (not
+enforced for test accepts):
 
 * Packages must be child-with-unconfirmed-parents packages. This also means packages must contain at
   least 2 transactions. (#22674)