[refactor] Make TransactionWithinChainLimit more flexible

Summary:

• Add GetTransactionAncestry to CTxMemPool for general purpose chain limit checking
• Switch to GetTransactionAncestry() in OutputEligibleForSpending
• Remove deprecated TransactionWithinChainLimit
• wallet: Strictly greater than for ancestor caps
• wallet: Switch to using ancestor/descendant limits

Instead of combining the -limitancestorcount and -limitdescendantcount into a nMaxChainLength, this commit uses each one separately in the coin eligibility filters.

• test: Add MempoolAncestryTests

This is a backport of Core PR12634

Depends on D3336 and D3342

Test Plan:

make check
./test/functional/test_runner.py

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D3343