[#927] Improvement: improve the control of server heartbeat

[summaryzb]

What changes were proposed in this pull request?

Eleminate rss.server.heartbeat.timeout replaced with rss.server.heartbeat.interval

Why are the changes needed?

#927

Does this PR introduce any user-facing change?

Yes, rss.server.heartbeat.timeout will effect nothing

How was this patch tested?

UnitTest

[codecov-commenter]

Codecov Report

Merging #928 (52a457c) into master (d09cdc2) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #928      +/-   ##
============================================
- Coverage     55.53%   55.51%   -0.03%     
  Complexity     2246     2246              
============================================
  Files           341      341              
  Lines         16626    16620       -6     
  Branches       1327     1327              
============================================
- Hits           9234     9227       -7     
  Misses         6863     6863              
- Partials        529      530       +1     

Impacted Files	Coverage Δ
...apache/hadoop/mapreduce/v2/app/RssMRAppMaster.java	0.00% <ø> (ø)
...a/org/apache/uniffle/server/RegisterHeartBeat.java	87.71% <ø> (-0.22%)	⬇️
...a/org/apache/uniffle/server/ShuffleServerConf.java	99.43% <ø> (-0.01%)	⬇️

... and 1 file with indirect coverage changes

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[summaryzb]

PTAL @jerqi

[jerqi]

LGTM, thanks @summaryzb , the pipeline of mr-hadoop3.2 's failure is unrelated to this pr, merged to master.