refactor(dns): narrow crawler catch to FormatException/NotSupportedException and cover e=/l= cases

Author: AnkushinDaniil

src/Nethermind/Nethermind.Network.Dns.Test/EnrTreeParserTests.cs

@@ -49,6 +49,8 @@ public void Can_parse_leaf()
     [TestCase("enrtree-root:v1 e=TPLRUM3FAKJZIRMXADWOHSU3PM l=FDXN3SN67NA5DKA4J2GOK7BVQI sig=CNoJofW_lNh7QFQkaVGhEX2ifbEZ3UkiBQCVyZCkM_I-72cEh8Bfd21cSS9BP5tyAqWF3jMVov8duUCdSByEQAE", TestName = "seq field missing")]
     [TestCase("enrtree-root:v1 e=TPLRUM3FAKJZIRMXADWOHSU3PM l=FDXN3SN67NA5DKA4J2GOK7BVQI seq=2779 sig=SHORT", TestName = "truncated sig field")]
     [TestCase("enrtree-root:v1 e=TPLRUM3FAKJZIRMXADWOHSU3PM l=FDXN3SN67NA5DKA4J2GOK7BVQI seq=notanumber sig=CNoJofW_lNh7QFQkaVGhEX2ifbEZ3UkiBQCVyZCkM_I-72cEh8Bfd21cSS9BP5tyAqWF3jMVov8duUCdSByEQAE", TestName = "non-numeric seq value")]
+    [TestCase("enrtree-root:v1 l=FDXN3SN67NA5DKA4J2GOK7BVQI seq=2779 sig=CNoJofW_lNh7QFQkaVGhEX2ifbEZ3UkiBQCVyZCkM_I-72cEh8Bfd21cSS9BP5tyAqWF3jMVov8duUCdSByEQAE", TestName = "e field missing")]
+    [TestCase("enrtree-root:v1 e=TPLRUM3FAKJZIRMXADWOHSU3PM seq=2779 sig=CNoJofW_lNh7QFQkaVGhEX2ifbEZ3UkiBQCVyZCkM_I-72cEh8Bfd21cSS9BP5tyAqWF3jMVov8duUCdSByEQAE", TestName = "l field missing")]
     public void Malformed_enrtree_root_throws_FormatException(string malformedRoot)
         => Assert.That(() => EnrTreeParser.ParseEnrRoot(malformedRoot), Throws.TypeOf<FormatException>());
 

src/Nethermind/Nethermind.Network.Dns/EnrTreeCrawler.cs

@@ -58,7 +58,7 @@ private async IAsyncEnumerable<string> SearchNode(IDnsClient client, string quer
                 {
                     treeNode = EnrTreeParser.ParseNode(node);
                 }
-                catch (Exception e) when (e is FormatException or NotSupportedException or ArgumentException)
+                catch (Exception e) when (e is FormatException or NotSupportedException)
                 {
                     // A single malformed record from an untrusted DNS server must not abort the whole crawl.
                     if (_logger.IsDebug) _logger.Debug($"Skipping malformed ENR tree record from DNS query '{query}': {e.Message}");