Skip hole tags in local_cache view (#11454)

## Problem

If the local file cache is shrunk, so that we punch some holes in the
underlying file, the local_cache view displays the holes incorrectly.
See https://github.com/neondatabase/neon/issues/10770

## Summary of changes

Skip hole tags in the local_cache view.

---------

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

test_runner/regress/test_lfc_resize.py

@@ -49,6 +49,8 @@ def test_lfc_resize(neon_simple_env: NeonEnv, pg_bin: PgBin):
     conn = endpoint.connect()
     cur = conn.cursor()
 
+    cur.execute("create extension neon")
+
     def get_lfc_size() -> tuple[int, int]:
         lfc_file_path = endpoint.lfc_path()
         lfc_file_size = lfc_file_path.stat().st_size
@@ -103,3 +105,23 @@ def test_lfc_resize(neon_simple_env: NeonEnv, pg_bin: PgBin):
         time.sleep(1)
 
     assert int(lfc_file_blocks) <= 128 * 1024
+
+    # Now test that number of rows returned by local_cache is the same as file_cache_used_pages.
+    # Perform several iterations to make cache cache content stabilized.
+    nretries = 10
+    while True:
+        cur.execute("select count(*) from local_cache")
+        local_cache_size = cur.fetchall()[0][0]
+
+        cur.execute(
+            "select lfc_value::bigint FROM neon_lfc_stats where lfc_key='file_cache_used_pages'"
+        )
+        used_pages = cur.fetchall()[0][0]
+
+        if local_cache_size == used_pages or nretries == 0:
+            break
+
+        nretries = nretries - 1
+        time.sleep(1)
+
+    assert local_cache_size == used_pages