Rename AcquireJobRequest::StreamID to AcquireJobRequest::JobMessageID (#2547)

* Rename AcquireJobRequest::StreamID to AcquireJobRequest::JobMessageID to match corresponding server-side update.
* appeased the linter
* Added unit tests to prove AcquireJobRequest serialization/deserialization is as-expected.
* Distinguish unit test variations.
* Incorporated PR Feedback.

src/Test/L0/Sdk/RSWebApi/AcquireJobRequestL0.cs

@@ -0,0 +1,63 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.Serialization.Json;
+using System.Text;
+using Xunit;
+
+namespace GitHub.Actions.RunService.WebApi.Tests;
+
+public sealed class AcquireJobRequestL0
+{
+
+    [Fact]
+    [Trait("Level", "L0")]
+    [Trait("Category", "Common")]
+    public void VerifySerialization()
+    {
+        var jobMessageId = "1526919030369-33";
+        var request = new AcquireJobRequest
+        {
+            JobMessageId = jobMessageId,
+            StreamId = jobMessageId
+        };
+        var serializer = new DataContractJsonSerializer(typeof(AcquireJobRequest));
+        using var stream = new MemoryStream();
+        serializer.WriteObject(stream, request);
+
+        stream.Position = 0;
+        using var reader = new StreamReader(stream, Encoding.UTF8);
+        string json = reader.ReadToEnd();
+        string expected = DoubleQuotify(string.Format("{{'jobMessageId':'{0}','streamId':'{0}'}}", request.JobMessageId));
+        Assert.Equal(expected, json);
+
+    }
+
+    [Fact]
+    [Trait("Level", "L0")]
+    [Trait("Category", "Common")]
+    public void VerifyDeserialization()
+    {
+        var serializer = new DataContractJsonSerializer(typeof(AcquireJobRequest));
+        var variations = new Dictionary<string, string>()
+        {
+            ["{'streamId': 'legacy', 'jobMessageId': 'new-1'}"] = "new-1",
+            ["{'jobMessageId': 'new-2', 'streamId': 'legacy'}"] = "new-2",
+            ["{'jobMessageId': 'new-3'}"] = "new-3"
+        };
+
+        foreach (var (source, expected) in variations)
+        {
+            using var stream = new MemoryStream();
+            stream.Write(Encoding.UTF8.GetBytes(DoubleQuotify(source)));
+            stream.Position = 0;
+            var recoveredRecord = serializer.ReadObject(stream) as AcquireJobRequest;
+            Assert.NotNull(recoveredRecord);
+            Assert.Equal(expected, recoveredRecord.JobMessageId);
+        }
+    }
+
+    private static string DoubleQuotify(string text)
+    {
+        return text.Replace('\'', '"');
+    }
+}