Select testng as the test provider explicitly instead of relying on the classpath

[soumitra-st]

I am adding testcases which brings in below dependencies:

    <dependency>
        <groupId>org.glassfish.jersey.test-framework</groupId>
        <artifactId>jersey-test-framework-core</artifactId>
        <version>2.26</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.test-framework.providers</groupId>
        <artifactId>jersey-test-framework-provider-grizzly2</artifactId>
        <version>2.26</version>
    </dependency>

However, these dependencies also pulls in junit jars, as a result of that the test provider becomes junit, and creates issues.

Hence, adding explicit configuration of test provider to testng for surefire plugin in this PR.

[codecov-commenter]

Codecov Report

Merging #11612 (b41f1cb) into master (49196ec) will increase coverage by 0.00%.
Report is 2 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #11612   +/-   ##
=========================================
  Coverage     63.15%   63.15%           
  Complexity      207      207           
=========================================
  Files          2324     2324           
  Lines        124534   124534           
  Branches      18994    18994           
=========================================
+ Hits          78645    78647    +2     
+ Misses        40302    40299    -3     
- Partials       5587     5588    +1     

Flag	Coverage Δ
integration	<0.01% <ø> (ø)
integration1	<0.01% <ø> (ø)
integration2	0.00% <ø> (ø)
java-11	50.11% <ø> (ø)
java-17	63.01% <ø> (ø)
java-20	67.26% <ø> (+4.24%)	⬆️
temurin	63.15% <ø> (+<0.01%)	⬆️
unittests	63.14% <ø> (+<0.01%)	⬆️
unittests1	67.45% <ø> (+<0.01%)	⬆️
unittests2	14.51% <ø> (-0.01%)	⬇️

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see 5 files with indirect coverage changes

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