Fix non-corruption in testCurrentHeaderVersion (elastic#50883)

Today we make multiple attempts to corrupt the translog header in
`TranslogHeaderTests#testCurrentHeaderVersion`, but if we are extraordinarily
unlucky then this sequence of corruptions may restore the file to its original
state. This change adjusts the test to only corrupt the file once, which is
certain not to leave the file in its original state.

server/src/test/java/org/elasticsearch/index/translog/TranslogHeaderTests.java

@@ -52,14 +52,11 @@ public void testCurrentHeaderVersion() throws Exception {
         }
         final TranslogCorruptedException mismatchUUID = expectThrows(TranslogCorruptedException.class, () -> {
             try (FileChannel channel = FileChannel.open(translogFile, StandardOpenOption.READ)) {
-                TranslogHeader.read(UUIDs.randomBase64UUID(), translogFile, channel);
+                TranslogHeader.read(randomValueOtherThan(translogUUID, UUIDs::randomBase64UUID), translogFile, channel);
             }
         });
         assertThat(mismatchUUID.getMessage(), containsString("this translog file belongs to a different translog"));
-        int corruptions = between(1, 10);
-        for (int i = 0; i < corruptions && Files.size(translogFile) > 0; i++) {
-            TestTranslog.corruptFile(logger, random(), translogFile, false);
-        }
+        TestTranslog.corruptFile(logger, random(), translogFile, false);
         final TranslogCorruptedException corruption = expectThrows(TranslogCorruptedException.class, () -> {
             try (FileChannel channel = FileChannel.open(translogFile, StandardOpenOption.READ)) {
                 TranslogHeader.read(randomBoolean() ? outHeader.getTranslogUUID() : UUIDs.randomBase64UUID(), translogFile, channel);