[Minor] Cleanup "throws RuntimeException"

[kaijchen]

What changes were proposed in this pull request?

Remove "throws RuntimeException" from method signature.

Why are the changes needed?

There is no need to declare "throws RuntimeException".

Does this PR introduce any user-facing change?

No.

How was this patch tested?

CI.

[codecov-commenter]

Codecov Report

Merging #549 (9f7cee2) into master (3a63386) will increase coverage by 0.66%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #549      +/-   ##
============================================
+ Coverage     59.44%   60.10%   +0.66%     
+ Complexity     1787     1655     -132     
============================================
  Files           213      200      -13     
  Lines         12351    11075    -1276     
  Branches       1042      920     -122     
============================================
- Hits           7342     6657     -685     
+ Misses         4600     4039     -561     
+ Partials        409      379      -30     

Impacted Files	Coverage Δ
...org/apache/spark/shuffle/RssSparkShuffleUtils.java	69.38% <ø> (ø)
.../java/org/apache/uniffle/common/util/RssUtils.java	58.45% <ø> (ø)
.../org/apache/uniffle/coordinator/AccessManager.java	94.28% <ø> (ø)
...n/java/org/apache/hadoop/mapreduce/MRIdHelper.java
.../hadoop/mapreduce/task/reduce/RssBypassWriter.java
...rg/apache/hadoop/mapred/RssMapOutputCollector.java
.../hadoop/mapreduce/task/reduce/RssEventFetcher.java
...n/java/org/apache/hadoop/mapreduce/RssMRUtils.java
...pache/hadoop/mapreduce/task/reduce/RssShuffle.java
...pache/hadoop/mapreduce/task/reduce/RssFetcher.java
... and 6 more

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