[JENKINS-52850] Improve credentials helper section and add SSH support

[Dohbedoh]

JENKINS-52850

• Add support for SSH with Private Key credentials in the environment block of declarative pipeline.
• Improve the current documentation for credentials helper.

[MarkEWaite]

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[jenkinsadmin]

Build failed; the context from the latest run is:

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./scripts/groovy pull
jre-alpine: Pulling from library/groovy
8e402f1a9c57: Pulling fs layer
4866c822999c: Pulling fs layer
0c5bd74861e4: Pulling fs layer
20fbb2046271: Pulling fs layer
e323e4749c2c: Pulling fs layer
20fbb2046271: Waiting
e323e4749c2c: Waiting
8e402f1a9c57: Verifying Checksum
8e402f1a9c57: Download complete
4866c822999c: Verifying Checksum
4866c822999c: Download complete
e323e4749c2c: Verifying Checksum
e323e4749c2c: Download complete
8e402f1a9c57: Pull complete
20fbb2046271: Verifying Checksum
20fbb2046271: Download complete
4866c822999c: Pull complete
0c5bd74861e4: Verifying Checksum
0c5bd74861e4: Download complete
0c5bd74861e4: Pull complete
20fbb2046271: Pull complete
e323e4749c2c: Pull complete
Digest: sha256:2164b5535f4dec72c123b5667df9275d9d73250a7859a8edd0a94a8a1cbc40cf
Status: Downloaded newer image for groovy:jre-alpine
./scripts/groovy scripts/release.rss.groovy 'https://updates.jenkins.io/release-history.json' > build/_site/releases.rss
Caught: groovy.json.JsonException: Unable to process url: https://updates.jenkins.io/release-history.json
groovy.json.JsonException: Unable to process url: https://updates.jenkins.io/release-history.json
	at release_rss.run(release.rss.groovy:18)
Caused by: java.net.SocketException: Connection reset
	... 1 more
Makefile:49: recipe for target 'build/fetch' failed
make: *** [build/fetch] Error 1
[Pipeline] }
[Pipeline] // timeout
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // node
[Pipeline] echo
Caught: hudson.AbortException: script returned exit code 2
[Pipeline] mail
[Pipeline] End of Pipeline

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ERROR: script returned exit code 2
Finished: FAILURE

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