Do not produce error if gin page is not restored in redo (#7876)

## Problem

See https://github.com/neondatabase/cloud/issues/10845

## Summary of changes

Do not report error if GIN page is not restored

## Checklist before requesting a review

- [ ] I have performed a self-review of my code.
- [ ] If it is a core feature, I have added thorough tests.
- [ ] Do we need to implement analytics? if so did you add the relevant
metrics to the dashboard?
- [ ] If this PR requires public announcement, mark it with
/release-notes label and add several sentences in this section.

## Checklist before merging

- [ ] Do not forget to reformat commit message to not include the above
checklist

---------

Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>

test_runner/regress/test_gin_redo.py

@@ -0,0 +1,22 @@
+import time
+
+from fixtures.neon_fixtures import NeonEnv, wait_replica_caughtup
+
+
+#
+# Test that redo of XLOG_GIN_VACUUM_PAGE doesn't produce error
+#
+def test_gin_redo(neon_simple_env: NeonEnv):
+    env = neon_simple_env
+
+    primary = env.endpoints.create_start(branch_name="main", endpoint_id="primary")
+    time.sleep(1)
+    secondary = env.endpoints.new_replica_start(origin=primary, endpoint_id="secondary")
+    con = primary.connect()
+    cur = con.cursor()
+    cur.execute("create table gin_test_tbl(id integer, i int4[])")
+    cur.execute("create index gin_test_idx on gin_test_tbl using gin (i)")
+    cur.execute("insert into gin_test_tbl select g,array[3, 1, g] from generate_series(1, 10000) g")
+    cur.execute("delete from gin_test_tbl where id % 2 = 0")
+    cur.execute("vacuum gin_test_tbl")
+    wait_replica_caughtup(primary, secondary)