changefeedccl: future-proof TestChangefeedProtectedTimestamps

The low gc.ttlseconds in this test that applies to
system.{descriptor,zones}, when run with span configs enabled (in a
future commit), runs into errors introduced in cockroachdb#73086. The span configs
infrastructure makes use of rangefeeds against these tables within the
spanconfig.SQLWatcher process. These rangefeeds error out if the
timestamp they're started with is already GC-ed, something that's very
likely with low GC TTLs. To accommodate, we simply bump the TTL to a
more reasonable 100s.

Release note: None

pkg/ccl/changefeedccl/changefeed_test.go

@@ -3578,8 +3578,8 @@ func TestChangefeedProtectedTimestamps(t *testing.T) {
 		func(t *testing.T, db *gosql.DB, f cdctest.TestFeedFactory) {
 			defer close(done)
 			sqlDB := sqlutils.MakeSQLRunner(db)
-			sqlDB.Exec(t, `ALTER RANGE default CONFIGURE ZONE USING gc.ttlseconds = 1`)
-			sqlDB.Exec(t, `ALTER RANGE system CONFIGURE ZONE USING gc.ttlseconds = 1`)
+			sqlDB.Exec(t, `ALTER RANGE default CONFIGURE ZONE USING gc.ttlseconds = 100`)
+			sqlDB.Exec(t, `ALTER RANGE system CONFIGURE ZONE USING gc.ttlseconds = 100`)
 			sqlDB.Exec(t, `CREATE TABLE foo (a INT PRIMARY KEY, b STRING)`)
 			sqlDB.Exec(t, `INSERT INTO foo VALUES (1, 'a'), (2, 'b'), (4, 'c'), (7, 'd'), (8, 'e')`)