Remove stale ApiCompat suppressions for re-added TimeSpanMillisecondsConverter

The upstream merge brought in CP0001 baseline suppressions for
TimeSpanMillisecondsConverter (the Tasks rework had deleted the type). This
branch keeps the type for the SEP-2549 cacheable results, so those suppressions
are now unnecessary and fail package validation (make pack) in Release. Drop the
four stale entries so ApiCompat passes.

Author: Tarek Mahmoud Sayed

src/ModelContextProtocol.Core/CompatibilitySuppressions.xml

@@ -134,13 +134,6 @@
     <Right>lib/net10.0/ModelContextProtocol.Core.dll</Right>
     <IsBaselineSuppression>true</IsBaselineSuppression>
   </Suppression>
-  <Suppression>
-    <DiagnosticId>CP0001</DiagnosticId>
-    <Target>T:ModelContextProtocol.Protocol.TimeSpanMillisecondsConverter</Target>
-    <Left>lib/net10.0/ModelContextProtocol.Core.dll</Left>
-    <Right>lib/net10.0/ModelContextProtocol.Core.dll</Right>
-    <IsBaselineSuppression>true</IsBaselineSuppression>
-  </Suppression>
   <Suppression>
     <DiagnosticId>CP0001</DiagnosticId>
     <Target>T:ModelContextProtocol.Protocol.ToolExecution</Target>
@@ -295,13 +288,6 @@
     <Right>lib/net8.0/ModelContextProtocol.Core.dll</Right>
     <IsBaselineSuppression>true</IsBaselineSuppression>
   </Suppression>
-  <Suppression>
-    <DiagnosticId>CP0001</DiagnosticId>
-    <Target>T:ModelContextProtocol.Protocol.TimeSpanMillisecondsConverter</Target>
-    <Left>lib/net8.0/ModelContextProtocol.Core.dll</Left>
-    <Right>lib/net8.0/ModelContextProtocol.Core.dll</Right>
-    <IsBaselineSuppression>true</IsBaselineSuppression>
-  </Suppression>
   <Suppression>
     <DiagnosticId>CP0001</DiagnosticId>
     <Target>T:ModelContextProtocol.Protocol.ToolExecution</Target>
@@ -456,13 +442,6 @@
     <Right>lib/net9.0/ModelContextProtocol.Core.dll</Right>
     <IsBaselineSuppression>true</IsBaselineSuppression>
   </Suppression>
-  <Suppression>
-    <DiagnosticId>CP0001</DiagnosticId>
-    <Target>T:ModelContextProtocol.Protocol.TimeSpanMillisecondsConverter</Target>
-    <Left>lib/net9.0/ModelContextProtocol.Core.dll</Left>
-    <Right>lib/net9.0/ModelContextProtocol.Core.dll</Right>
-    <IsBaselineSuppression>true</IsBaselineSuppression>
-  </Suppression>
   <Suppression>
     <DiagnosticId>CP0001</DiagnosticId>
     <Target>T:ModelContextProtocol.Protocol.ToolExecution</Target>
@@ -617,13 +596,6 @@
     <Right>lib/netstandard2.0/ModelContextProtocol.Core.dll</Right>
     <IsBaselineSuppression>true</IsBaselineSuppression>
   </Suppression>
-  <Suppression>
-    <DiagnosticId>CP0001</DiagnosticId>
-    <Target>T:ModelContextProtocol.Protocol.TimeSpanMillisecondsConverter</Target>
-    <Left>lib/netstandard2.0/ModelContextProtocol.Core.dll</Left>
-    <Right>lib/netstandard2.0/ModelContextProtocol.Core.dll</Right>
-    <IsBaselineSuppression>true</IsBaselineSuppression>
-  </Suppression>
   <Suppression>
     <DiagnosticId>CP0001</DiagnosticId>
     <Target>T:ModelContextProtocol.Protocol.ToolExecution</Target>