[SPARK-46194][BUILD] Remove TODO comments left in SPARK-33775

### What changes were proposed in this pull request?
This pr just remove TODO SPARK-33805 because after #43890 merged, all TODOs related to cleaning up deprecated Scala APIs have been completed.

### Why are the changes needed?
Remove completed TODO.

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
Pass GitHub Actions

### Was this patch authored or co-authored using generative AI tooling?
No

Closes #44103 from LuciferYang/SPARK-46194.

Authored-by: yangjie01 <yangjie01@baidu.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>

pom.xml

@@ -2973,10 +2973,6 @@
               <arg>-Wconf:cat=deprecation:wv,any:e</arg>
               <arg>-Wunused:imports</arg>
               <arg>-Wconf:cat=scaladoc:wv</arg>
-              <!--
-                SPARK-33775 Suppress compilation warnings that contain the following contents.
-                TODO(SPARK-33805): Undo the corresponding deprecated usage suppression rule after fixed.
-              -->
               <arg>-Wconf:msg=^(?=.*?method|value|type|object|trait|inheritance)(?=.*?deprecated)(?=.*?since 2.13).+$:e</arg>
               <arg>-Wconf:msg=^(?=.*?Widening conversion from)(?=.*?is deprecated because it loses precision).+$:e</arg>
               <!-- SPARK-45610 Convert "Auto-application to `()` is deprecated" to compile error, as it will become a compile error in Scala 3. -->

project/SparkBuild.scala

@@ -232,9 +232,6 @@ object SparkBuild extends PomBuild {
         "-Wconf:cat=deprecation:wv,any:e",
         // 2.13-specific warning hits to be muted (as narrowly as possible) and addressed separately
         "-Wunused:imports",
-        // SPARK-33775 Suppress compilation warnings that contain the following contents.
-        // TODO(SPARK-33805): Undo the corresponding deprecated usage suppression rule after
-        //  fixed.
         "-Wconf:msg=^(?=.*?method|value|type|object|trait|inheritance)(?=.*?deprecated)(?=.*?since 2.13).+$:e",
         "-Wconf:msg=^(?=.*?Widening conversion from)(?=.*?is deprecated because it loses precision).+$:e",
         // SPARK-45610 Convert "Auto-application to `()` is deprecated" to compile error, as it will become a compile error in Scala 3.