[SpotBugs] Enable SC_START_IN_CTOR check

[kaijchen]

What changes were proposed in this pull request?

Remove SC_START_IN_CTOR from spotbugs-exclude.xml.
It was excluded in #517 by mistake.

Why are the changes needed?

#532

Does this PR introduce any user-facing change?

No.

How was this patch tested?

CI.

[advancedxy]

LGTM, pending CI passes.

[codecov-commenter]

Codecov Report

Merging #541 (35e93ea) into master (a45be20) will decrease coverage by 0.54%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #541      +/-   ##
============================================
- Coverage     59.18%   58.65%   -0.54%     
+ Complexity     1785     1566     -219     
============================================
  Files           213      191      -22     
  Lines         12356    10523    -1833     
  Branches       1042      883     -159     
============================================
- Hits           7313     6172    -1141     
+ Misses         4636     3987     -649     
+ Partials        407      364      -43     

Impacted Files	Coverage Δ
...storage/handler/impl/DataSkippableReadHandler.java	83.78% <0.00%> (-2.71%)	⬇️
.../hadoop/mapreduce/task/reduce/RssEventFetcher.java
...mapreduce/task/reduce/RssInMemoryRemoteMerger.java
...apache/hadoop/mapreduce/v2/app/RssMRAppMaster.java
...rg/apache/hadoop/mapred/RssMapOutputCollector.java
...n/java/org/apache/hadoop/mapreduce/MRIdHelper.java
...n/java/org/apache/hadoop/mapreduce/RssMRUtils.java
...pache/hadoop/mapreduce/task/reduce/RssShuffle.java
...ava/org/apache/spark/shuffle/RssShuffleHandle.java
...g/apache/hadoop/mapred/SortWriteBufferManager.java
... and 13 more

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[kaijchen]

Sorry, referenced the wrong issue. Should be #532.