test: remove trivial, duplicate and content-value tests (#2721)

## Summary
Many tests proved a specific change when it landed but don't need to run on every CI build forever. This removes **202 test methods and 9 files: 313 test cases, 2,247 → 1,934**. UOContent.Tests drops from about 14s to about 5s locally.

Removed:
- **Tautologies.** Asserting a constant, a constructor readback or a trivial getter, or testing BCL behavior.
- **Exact duplicates** of a surviving test on the same code path.
- **Obsolete regressions** whose failure can no longer be expressed.
- **Game-content values** shard owners customize (era drop rates, loot and skill tables, single-creature tuning). Each customization would otherwise force a test fix.

## How it was decided
1. Every test was classified, with a reason, by a per-shard sweep over all 287 test files.
2. Each proposed deletion was then checked by a second, adversarial reviewer against the surviving tests and the production code.
3. Anything that was the only coverage of a separate code path was **kept**, even where it looked like a duplicate. Examples: the unsigned `SpanReader`/`SpanWriter` methods, the at-location versus bounds enumerators, null-map enumerables, the security filters, archive-journal state transitions. About 130 proposed deletions were rejected this way.

Whole files removed:
- `FishingTests`, apart from 3 tests: the map-edge scan, serpent cleanup, and SOS chest consumption. The SOS test now stops at the first chest instead of measuring a catch rate. The multi-million-cast rate simulations are gone.
- `LordOaksTests` and `MeerEnragedTests` (single-creature tests).
- `AutoArchiveHelperTests`, `JsonDiscoverableTypeAttributeTests`, `DecimalSerializationTests` and `EnumConversionTests` (tautologies, or tests of their own local helpers).
- `NetworkStatsTests`.
- `MigratedDataLoadTests` (a subset of `AllSpawnFilesLoadTests`).
- `SpawnerFixtureCapture`: a capture tool, not a test, and its `version == 12` assert can no longer pass. The `.bin` fixtures it produced stay.

## Tests
- Server.Tests: 811 pass.
- UOContent.Tests: 1,123 pass.

A follow-up PR, stacked on this one, fixes how the remaining tests behave: shared state, CI-vacuous tests, harness duplication.

Projects/Server.Tests/Tests/Geometry/WorldLocationTests.cs

@@ -39,40 +39,6 @@ public sealed class WorldLocationTests
         Assert.Equal($"({min}, {min}, {min}) [{_superLongMapName}]", new WorldLocation(min, min, min, map).ToString());
     }
 
-    [Theory]
-    [InlineData(null)]
-    [InlineData("Internal Map")]
-    [InlineData(_superLongMapName)]
-    public void TestWorldLocationTryFormatSucceeds(string mapName)
-    {
-        var map = mapName != null ? CreateMap(mapName) : null;
-        var mapNameLength = mapName?.Length ?? _nullMap.Length;
-
-        const int max = int.MaxValue;
-        const int min = int.MinValue;
-        var array = new char[128];
-
-        var p1 = new WorldLocation(0, 0, 0, map);
-        Assert.True(p1.TryFormat(array, out var cp1, null, null));
-        Assert.Equal(9 + 3 + mapNameLength, cp1);
-        Array.Clear(array);
-
-        var p2 = new WorldLocation(1, 1, 1, map);
-        Assert.True(p2.TryFormat(array, out var cp2, null, null));
-        Assert.Equal(9 + 3 + mapNameLength, cp2);
-        Array.Clear(array);
-
-        array = new char[256]; // We need a bigger buffer!
-        var p3 = new WorldLocation(max, max, max, map);
-        Assert.True(p3.TryFormat(array, out var cp3, null, null));
-        Assert.Equal(9 + 30 + mapNameLength, cp3);
-        Array.Clear(array);
-
-        var p4 = new WorldLocation(min, min, min, map);
-        Assert.True(p4.TryFormat(array, out var cp4, null, null));
-        Assert.Equal(9 + 33 + mapNameLength, cp4);
-    }
-
     [Theory]
     [InlineData(null)]
     [InlineData("Internal Map")]