fix: wal disabled

[gfanton]

fix #5109

This PR include 2 fixes:

---

Issue 1

When integration tests spawn subprocess nodes, the configuration is serialized to JSON and passed via stdin. The WALDisabled field in the consensus configuration has a json:"-" tag, which means it is excluded from JSON serialization. This exclusion causes WALDisabled to default to false, resulting in WAL files being created even though the parent process intended to disable them. This issue arose when running a test multiple times (-count=X) and when restarting the node, as the genesis was changing but not the WAL file.
-> I now force-set WALDisabled to false, as it is unnecessary for integration tests. I also prevent WAL catch-up when WAL is disabled.

---

issue 2

When restarting the node during testing, it will not produce blocks (CreateEmptyBlocks = false - the test default for determinism) until it receives transactions. However, the tests wait for Ready() (which is waiting for a block to appear) before sending transactions, resulting in a deadlock.
-> Simply mark the node as ready when if any block is present when starting the node

[Gno2D2]

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Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
tm2/pkg/bft/node/node.go	70.00%	1 Missing and 2 partials ⚠️

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