[SCB-2731] fix flaky junit tests in common and core

[anantdahiya8]

Summary

1. TestInvocation#traceIdGeneratorInit

• Using containsInAnyOrder so that the junit test passes for every order of the values

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2. TestRestClientRequestImpl#testForm

• Checking all possible values so that the test does not fail

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3. TestRestClientRequestImpl#testCookie

• Mocking for both cases "region=china-north; sessionid=abcdefghijklmnopqrstuvwxyz; " and "sessionid=abcdefghijklmnopqrstuvwxyz; region=china-north; ", So that the mock function works for both the cases

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4. RestServerCodecFilterTest#should_convert_exception_to_response_when_decode_request_failed

• Json.encode can return the json string in different order. We need to check for all the possible values so that the test does not fail for some cases.

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5. RestProducerInvocationCreatorTest#should_failed_when_not_defined_any_schema

• Json.encode can return the json string in different order. We need to check for all the possible values so that the test does not fail for some cases.

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6. RestProducerInvocationCreatorTest#should_failed_when_accept_is_not_support

• Json.encode can return the json string in different order. We need to check for all the possible values so that the test does not fail for some cases.

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Bug Link : https://issues.apache.org/jira/projects/SCB/issues/SCB-2731

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[codecov-commenter]

Codecov Report

Merging #3501 (fe65835) into master (8a7f6b2) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #3501   +/-   ##
=========================================
  Coverage     74.38%   74.39%           
  Complexity      670      670           
=========================================
  Files          1589     1589           
  Lines         39830    39830           
  Branches       3633     3633           
=========================================
+ Hits          29628    29631    +3     
+ Misses         8721     8718    -3     
  Partials       1481     1481           

Impacted Files	Coverage Δ
...mb/metrics/core/meter/os/cpu/AbstractCpuUsage.java	88.88% <0.00%> (-11.12%)	⬇️
...egistry/client/http/ServiceRegistryClientImpl.java	68.45% <0.00%> (+0.38%)	⬆️
...mb/config/ConfigCenterConfigurationSourceImpl.java	10.63% <0.00%> (+1.06%)	⬆️
.../servicecomb/registry/discovery/DiscoveryTree.java	100.00% <0.00%> (+3.27%)	⬆️

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