Combine `LruCache.invalidate` and `invalidate_many` (#9973)

* Make `invalidate` and `invalidate_many` do the same thing

... so that we can do either over the invalidation replication stream, and also
because they always confused me a bit.

* Kill off `invalidate_many`

* changelog

1 files changed, 3 insertions, 3 deletions

diff --git a/tests/util/caches/test_descriptors.py b/tests/util/caches/test_descriptors.py

index bbbc276697..0277998cbe 100644
--- a/tests/util/caches/test_descriptors.py
+++ b/tests/util/caches/test_descriptors.py
@@ -622,17 +622,17 @@ class CacheDecoratorTestCase(unittest.HomeserverTestCase):
         self.assertEquals(callcount2[0], 1)
 
         a.func2.invalidate(("foo",))
-        self.assertEquals(a.func2.cache.cache.pop.call_count, 1)
+        self.assertEquals(a.func2.cache.cache.del_multi.call_count, 1)
 
         yield a.func2("foo")
         a.func2.invalidate(("foo",))
-        self.assertEquals(a.func2.cache.cache.pop.call_count, 2)
+        self.assertEquals(a.func2.cache.cache.del_multi.call_count, 2)
 
         self.assertEquals(callcount[0], 1)
         self.assertEquals(callcount2[0], 2)
 
         a.func.invalidate(("foo",))
-        self.assertEquals(a.func2.cache.cache.pop.call_count, 3)
+        self.assertEquals(a.func2.cache.cache.del_multi.call_count, 3)
         yield a.func("foo")
 
         self.assertEquals(callcount[0], 2)