feat: add logic to overwrite defaultsJson's build_branch and pipeline_branch and add helper_ref

[zdtsw]

Fix #417
Fix #419

In order to use this overwrite feature, must set USE_ADOPT_SHELL_SCRIPTS to false for the downstream job,
or trigger from pipeline to uncheck useAdoptBashScripts

test: https://ci.adoptopenjdk.net/job/build-scripts-pr-tester/job/build-test/job/jobs/job/jdk17u/job/jdk17u-linux-x64-temurin/

Update:

This can be achieved by two ways:

• trigger build from openjdkX-pipeline ( main case, when official release)
  set

    buildReference  
    ciReference 
    helperReference

   untick `useAdoptBashScripts`

• trigger build from downstream job e.g jdk11u-alpine-linux-x64-temurin (minor case, but we need to support it)
  modify BUILD_CONFIGURATION 's default values:

    "BUILD_REF": "",
    "CI_REF": "",
    "HELPER_REF": "",
    "USE_ADOPT_SHELL_SCRIPTS": true,

this PR has below main changes:

1. in order to keep most of the logic of reading config from job (e.g jdk11u-alpine-linux-x64-temurin's paramter) the biggest change is to override variable DEFAULTS_JSON within in the build steps in openjdk_build_pipeline.groovy buildScripts()

DEFAULTS_JSON['repository']['build_branch'] = buildConfig.BUILD_REF ?: DEFAULTS_JSON['repository']['build_branch']
DEFAULTS_JSON['repository']['pipeline_branch'] = buildConfig.CI_REF ?: DEFAULTS_JSON['repository']['pipeline_branch']
DEFAULTS_JSON['repository']['helper_ref'] = buildConfig.HELPER_REF ?: DEFAULTS_JSON['repository']['helper_ref']

after this, everywhere uses DEFAULTS_JSON to get build_branch, pipeline_branch and helper_ref has been modified if they are set to a real value in the BUILD_CONFIGURATION
So, do a context.println JsonOutput.toJson(DEFAULTS_JSON) to see the real values we are using in the build.

2. replace openjdk-jenkins-helper@master which is used to do checkout of jenkins-helper repo to openjdk-jenkins-helper@${helperRef} which can use a variable (read out from DEFAULTS_JSON['repository']['helper_ref']) to point to either a branch or a tag if it has been updated from (1), or by buildConfig.HELPER_REF ?: DEFAULTS_JSON['repository']['helper_ref']

3. similar to (2), {DEFAULTS_JSON['repository']['build_branch']} is replaced to configuration.buildRef ?: DEFAULTS_JSON['repository']['build_branch']

4. TODO in src/test/groovy: need to enable test once the code is in master, or the GH action will fail·

5. fix lint: space, quotes ,minus(), length of line etc

P.S
for part in the pr-test's kick_off_tester, only set helperRef = DEFAULTS_JSON['repository']['helper_ref'] (i.e read from defaults.json because no intervention from parameter is used when pr-test triggered by GH action)
same reason for build_job_generator and build_pipeline_generator

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[zdtsw]

run tests quick 19

[eclipse-temurin-bot]

 PR TESTER RESULT 

❎ Some pipelines failed or the job was aborted! ❎
See the pipeline-build-check below for more information...

[zdtsw]

run tests quick 19

re-run https://ci.adoptopenjdk.net/job/build-scripts-pr-tester/job/build-test/job/jobs/job/jdk19/job/jdk19-alpine-linux-x64-temurin/60/console, due to previous docker build container failure

Passed

[eclipse-temurin-bot]

 PR TESTER RESULT 

❎ Some pipelines failed or the job was aborted! ❎
See the pipeline-build-check below for more information...

[zdtsw]

run tests quick 17

[eclipse-temurin-bot]

 PR TESTER RESULT 

✅ All pipelines passed! ✅

[zdtsw]

add more into description as "Updates" for what this PR does