Refactor: Get the max allowed RT directly from SentinelConfig.statisticMaxRt()

[sczyh30]

Describe what this PR does / why we need it

Get the max allowed RT directly from SentinelConfig.statisticMaxRt(), to avoid the class dependency chain: Constants -> SentinelConfig. The Constants class should not depend on any classes that could trigger static initialization.

Does this pull request fix one issue?

NONE

Describe how you did it

• Remove the legacy TIME_DROP_VALUE in Constants class (which was resolved with SentinelConfig.statisticMaxRt())
• Refactor related code to get the max allowed RT directly from SentinelConfig.statisticMaxRt()

Describe how to verify it

Run the test cases.

Special notes for reviews

NONE

[codecov-io]

Codecov Report

Merging #1173 into master will increase coverage by 0.01%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##             master   #1173      +/-   ##
===========================================
+ Coverage     42.78%   42.8%   +0.01%     
  Complexity     1538    1538              
===========================================
  Files           330     330              
  Lines          9764    9767       +3     
  Branches       1318    1319       +1     
===========================================
+ Hits           4178    4181       +3     
+ Misses         5069    5068       -1     
- Partials        517     518       +1

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/com/alibaba/csp/sentinel/Constants.java	100% <ø> (ø)	1 <0> (ø)	⬇️
...sp/sentinel/slots/statistic/data/MetricBucket.java	95.34% <100%> (ø)	23 <1> (ø)	⬇️
...ntinel/slots/block/degrade/DegradeRuleManager.java	21.87% <100%> (ø)	9 <0> (ø)	⬇️
...p/sentinel/slots/statistic/metric/ArrayMetric.java	68.62% <100%> (ø)	34 <0> (ø)	⬇️
...ba/csp/sentinel/slots/statistic/StatisticSlot.java	67.18% <33.33%> (+0.52%)	13 <0> (ø)	⬇️
...om/alibaba/csp/sentinel/config/SentinelConfig.java	56.75% <33.33%> (-0.99%)	14 <1> (ø)
.../slots/block/flow/controller/WarmUpController.java	78.84% <0%> (-3.85%)	10% <0%> (-1%)
...ava/com/alibaba/csp/sentinel/node/ClusterNode.java	96.55% <0%> (-3.45%)	10% <0%> (-1%)
...a/csp/sentinel/slots/statistic/base/LeapArray.java	72.27% <0%> (+4.95%)	35% <0%> (+2%)	⬆️

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[ghost]

LGTM