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test: convert xlog-py/big_lsn to luatest

xlog-py/big_lsn checks gh-4033: tarantool must handle huge LSNs. There
is no public API to jump the LSN, so the test injects one by rewriting
the vclock in an xlog's text header to a large value.

Rewrite it in luatest to structure the test better and to move toward
cutting off the obsolete diff-based mechanism.

This was the last test in xlog-py, so remove the remaining test suite
files.

The following patch was used to check that the converted test catches
the bug:

NO_WRAP
 | --- a/src/lib/vclock/vclock.h
 | +++ b/src/lib/vclock/vclock.h
 | @@ -148,7 +148,7 @@ vclock_get(const struct vclock *vclock, uint32_t replica_id)
 |  {
 |  	assert(replica_id < VCLOCK_MAX);
 |  	/* Evaluate a bitmask to avoid branching. */
 | -	int64_t mask = 0ULL - ((vclock->map >> replica_id) & 0x1);
 | +	int64_t mask = 0 - ((vclock->map >> replica_id) & 0x1);
 |  	return mask & vclock->lsn[replica_id];
 |  }
NO_WRAP

Drafted by an LLM, conducted and corrected by the commit author.

Part of #12909

NO_DOC=tests
NO_CHANGELOG=tests

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