AST-41922 fix the installer to get the envVars from the global Jenkins area

[tamarleviCm]

…s object to support running from a jenkins slave

Testing done

fix for a situation when the 'Install automatically' is on and the installer runs from a slave.

Submitter checklist

Preview Give feedback

1. Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
2. Ensure that the pull request title represents the desired changelog entry
3. Please describe what you did
4. Link to relevant issues in GitHub or Jira
5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[github-actions]

Checkmarx One – Scan Summary & Details – fae33df1-33a2-4778-bfd2-577748285775

Policy Management Violations

Policy Name	Rule(s)	Break Build
[SAST-ML0] Not allowed NEW Sast vulnerabilities		true

New Issues

Severity	Issue	Source File / Package	Checkmarx Insight
	Cleartext_Submission_of_Sensitive_Information	/src/main/java/com/checkmarx/jenkins/tools/ProxyHttpClient.java: 34	Attack Vector
	Cleartext_Submission_of_Sensitive_Information	/src/main/java/com/checkmarx/jenkins/tools/ProxyHttpClient.java: 34	Attack Vector
	Cleartext_Submission_of_Sensitive_Information	/src/main/java/com/checkmarx/jenkins/tools/ProxyHttpClient.java: 34	Attack Vector
	Unpinned Actions Full Length Commit SHA	/dependabot-auto-merge.yml: 23	Pinning an action to a full length commit SHA is currently the only way to use an action as an immutable release. Pinning to a particular SHA helps...
	Unpinned Actions Full Length Commit SHA	/cd.yml: 53	Pinning an action to a full length commit SHA is currently the only way to use an action as an immutable release. Pinning to a particular SHA helps...
	Unpinned Actions Full Length Commit SHA	/ast-scan.yml: 12	Pinning an action to a full length commit SHA is currently the only way to use an action as an immutable release. Pinning to a particular SHA helps...

Fixed Issues

Severity	Issue	Source File / Package
	Unpinned Actions Full Length Commit SHA	/ci.yml: 40
	Unpinned Actions Full Length Commit SHA	/manual-tag.yml: 23
	Unpinned Actions Full Length Commit SHA	/release.yml: 42
	Unpinned Actions Full Length Commit SHA	/release.yml: 53
	Unpinned Actions Full Length Commit SHA	/cd.yml: 24
	Unpinned Actions Full Length Commit SHA	/cd.yml: 17
	Unpinned Actions Full Length Commit SHA	/cd.yml: 55
	Unpinned Actions Full Length Commit SHA	/cd.yml: 34