Make some Java classes proper utilities

[vil02]

Purpose

Closes ballerina-platform/ballerina-library#4923.

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (72832c3) 81.44% compared to head (ca80dac) 81.68%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1790      +/-   ##
============================================
+ Coverage     81.44%   81.68%   +0.23%     
- Complexity        0      562     +562     
============================================
  Files           357      393      +36     
  Lines         19603    21343    +1740     
  Branches       4434     4780     +346     
============================================
+ Hits          15966    17433    +1467     
- Misses         2794     2930     +136     
- Partials        843      980     +137     

Files	Coverage Δ
...a/stdlib/http/compiler/HttpCompilerPluginUtil.java	91.79% <ø> (ø)
...ttp/compiler/HttpInterceptorResourceValidator.java	96.55% <ø> (ø)
...na/stdlib/http/compiler/HttpResourceValidator.java	84.33% <ø> (ø)
...ina/stdlib/http/compiler/codeaction/Constants.java	100.00% <ø> (ø)
...ina/stdlib/http/compiler/completion/Constants.java	100.00% <ø> (ø)
...va/io/ballerina/stdlib/http/api/HttpConstants.java	100.00% <ø> (ø)
...a/stdlib/http/api/logging/util/LogLevelMapper.java	88.88% <ø> (+4.67%)	⬆️
...dlib/http/api/nativeimpl/ExternRequestContext.java	87.50% <ø> (+1.78%)	⬆️
...lerina/stdlib/http/api/nativeimpl/ExternUtils.java	100.00% <ø> (+11.11%)	⬆️
...ort/contractimpl/common/states/Http2StateUtil.java	73.83% <ø> (+0.42%)	⬆️
... and 1 more

... and 40 files with indirect coverage changes

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[vil02]

@TharmiganK do you know what is the reason of PR Build / Run PR Build Workflow / Build on Windows failing? It does not seem to be related to the proposed change.

[TharmiganK]

@TharmiganK do you know what is the reason of PR Build / Run PR Build Workflow / Build on Windows failing? It does not seem to be related to the proposed change.

It seems to be an intermittent network failure. Re-triggered the check

[vil02]

Now it passed.